So what's boring around ESO is that there is clear meta in everything, like fire for magicka dps, high-crit for stamina etc
This is determined by fact that absolutely any build can be relatively easy copied.
Idea is to add random character traits, which provide affinity bonuses like "+10% to cold damage, -5% to fire damage", "use highest penetration for both magicka/stamina, but lowest crit chance" which will made each character build unique. This traits can be opened only by achievement points so just spamming character creator won't help.
For example first trait is opened at 2k achievement points, 2nd at 4k... 5th at 32k. given that each trait will have detrimental effects, character with 32k+ points will be more powerful then one with 2k, but still not OP. Well, in some rare cases it will be OP, but this is realistic, there are talented "OP" people IRL.
Alternative variant is similar to described in this post:
https://forums.elderscrollsonline.com/en/discussion/470781/special-1-time-armor-and-weapon-sets-that-you-cant-get-again
It may be not character traits, but random hereditary items (character bound), up to 5 1- or 2- piece set items which will be opened by achievement points. If you don't like them, don't use them, but if you wanna build ice mage or hybrid those traits/items may provide edge necessary to be effective in end game.