I read once or twice about disparity and the gap between older and newer players in ESO
my answer is that the focus of developers should not be on offering new ways to customize the toon, but to create new activities.
in swtor for instance, people spend their time playing a hand full of warzones over and over again (instanced pvp-matches of around 15 minutes) and
it's fun, because if teamwork works fine it's an enjoyable match... ; especially pug-groups that work well are enjoyable (for me personally) and even close losses, let alone wins.
so, i think, if customizing toons (builds ) would "stop" at some point, there would be some time for new players to catch up and start optimizing too...the optimization would give a slight to consistent advantage but not be the ultimate thing to win, because pvp is teamwork (like soccer or volleyball)
with spellcrafting, i think, customization (building) should have a break.... how was it in EVE online? a paying new player should be able to savor end-game content just like an old paying player... the difference should not be crushing...
What do you think about this?
Cheers,
Xandryah