That's a pile of...
Seriously, yes, burst is the way to go, yes TTK can be pretty low, but offense is not stronger than defense. If you build as a tank you can not expect to win a fight on your own except against very bad players. Of course, if you tank a group long enough that more people show up you may die if you're now to heavily outnumbered - or win the fight if you got some allies.
Sure, escape skills are nice, but how does that make offense stronger? Death in this game is meaningless. It does not do anything other than you have to ride a minute. And with some luck even get a nice fight on the way.
In a group, a tank is useful. You have to make a compromise between the individual playtyles in a group obviously, and that can mean a tank or a kiter or w/e is not always what you need now, but a tank can have it's use.
I have a very balanced build on my Sorc - mobility, defense, offense, support, regen, I have some of each of them and it works very well unless people use a lot of nirnhoned armor (wich will be changed).
I could deal a LOT more damage if I invested into it at the expense of defense for example. But it's not needed.
The problem that I think makes people speculate about things like these are the "infinite resources" - basically, with the removal of softcaps you are able to invest a lot more into specific attributes you favoured before already or you invest actually less and add other things to your build. For example my magicka regen is a good bit lower than it was in 1.5, but I got more cost reduction and max magicka, giving me much higher sustain and yet can use the Arena set instead of Seducer, thus gain stamina management on top of it.
A player who focuses purely on damage, will have a hard time against good players who simplay outlast him, as well as multible bad players because he often won't have the time to kill them one by one, since he is very squishy himself.
A player who focuses purely on regen, will have less damage and so on (even a build with 2500-3000 magicka/stamina regen and a lot of cost reduction will usually also have some damage, in sets and CP).
It simply wouldn't be a problem if you couldn't have to much attributes in total.
Hope someone understands what I mean, not the best post I ever wrote ^^.