So there is a lot of mixed feeling on the forums about the combat changes in Update 33.
I think that they are amazing. Here is why, in quite possibly a bit of a long winded fashion:
1) It makes the game more fun for casual players
I play this game a lot more seriously than my friends, but more than that, I always enjoy the theorycrafting and mechanical aspects of a game FAR more than anyone else I regularly interact with. Because of that, I know how it works under the hood and how skills and stats interact quite well. My friends that I get to play with me now and again do not. And they don't really care to. And that isn't inherently a bad thing. Games are about having a good time. I have a good time diving into numbers and finding synergies in disparate systems. They have a good time hitting bad guys with swords and spells. So when the game punishes them for going "Oh, I like the idea of playing as a person who charges in and rains death down on people with my flaming sword" because their Sword skills and their Fire skills were reliant on competing stats, they get annoyed. In most MMOs with set classes, your damage will all scale together as a package so this is what they are expecting to happen here. It sucks to tell them "You have to choose between being powerful or using the skill combination you like." This update fixes that. Now they can use whatever skills they think are cool and the Magicka/Stamina choice is instead all about "Which skills do you want to be able to use most often."
This doesn't just apply to my friends either. It probably applies to the majority of "LOW DPS" people random in dungeons. They probably just picked things that they thought looked fun to use and didn't realize that they were picking incompatible skills and weapons. With this change, casual players can have fun without needing to really worry about stat/skill synergy. They can just have fun.
2) It stops the game from punishing people needlessly
I have seen some people over the years talk about how it makes sense for Magicka/Stamina Hybrid characters to be punished with lower damage because they are hybrids and hybrids SHOULD be weaker than pure characters. And I agree with part of that but not the other part. I agree that Hybrids should have lower efficiency when compared to a pure build... but I disagree that a "Magicka/Stamina Hybrid" is actually a hybrid build within the context of the game.
The game has three distinct roles. Healer, Tank, Damage. You could subdivide those into Single Target and AOE varieties as well as Burst and Sustained if you want, and what I am about to say still applies to those diversifications within a role. How you decide to do those things is all effectively cosmetic. Class, as well as Magicka/Stamina are effectively cosmetic options in ESO and this is by design. They wanted any character to be able to play viably as any role (this is something they are still working on with balance patches and whathaveyou but it IS the end goal). Being a hybrid of roles does and will continue to give you more utility at the cost of lower efficiency. A Healer/Tank will not be as good of a Healer or Tank as a pure but will be able to fill both roles to some degree (and depending on the content, they may be able to successfully fill both roles allowing an extra DPS in the group). Same with any other combination. But a Magicka vs Stamina vs Magicka/Stamina DPS? Why should your ultimately cosmetic choice be punished by lowered efficiency. You are not gaining any extra utility, your build is still focused exclusively on dealing damage. This change will fix that problem and allow you to use the skills you find are more fun to use. You won't loose efficiency because of cosmetic choices.
3) But won't this completely destroy endgame balance? No.
Endgame balance doesn't exist within the same parameters as the rest of the game.
Balance for 99% of the player base can be simply described as "Every player regardless of class choice has the tools that they need to be able to complete all the content in the game, and no class should have an easily noticeable advantage or disadvantage over the other classes in this respect." Players simply have to feel like they can choose whichever class they want, and this choice alone will not make them outperform or be outperformed by others.
Balance for the top 1% however is WAY harder to achieve. It is a constant game of tug-of-war between the developers wanting all classes to be represented in endgame content and players trying to figure out what the numerically most effective build possible (META build) for any given role is. No matter how hard the developers work, there will ALWAYS be a single best build for any role. Those that choose to compete with eachother (since at this point it isn't the game you are competing with anymore. You outperform all of the challenges by a very large margin) at this level have already decided that numerical efficiency matters more than the cosmetic component of building a character.
This change WILL shift the META builds and new ones for each role will appear. But anyone trying to complain that it will "take choice away at the highest level of play by forcing everyone to play a handful builds" is deceiving themselves that such a choice has ever really existed.
Summary
So yeah... I think it is a great change. It will make the game better for 99% of players and it will shake the game up for the other 1% and force them to try completely bonkers things that they have never had to do before. Neither of those is a bad thing. And if you liked the build you have and want to keep playing it? Go ahead! This change isn't taking that away from you (unless you are in that 1%, but even then, every balance patch has the potential to do this) and your build will be just as good as it was before.