The difficulty of normal content is great as is. Do not revert them.

[Jinglypockets]

Most of the time, talent trees boil down to "Go to Icy Veins and let them tell you which talents to pick." You have to have pretty extensive game knowledge to be able to go off-book without kneecapping yourself. Of course, you can still customize and pick the abilities if you want if the "meta" picks aren't for you. I've certainly run into cases where the "meta" pick includes abilities I hate (looking at you, Primordial Wave), and having the ability to *just pick something else* goes a really long way.

I don't think character customization is the biggest benefit, though. The main thing, to me, is that it gives them a way to add new kinds of fun abilities and player power that doesn't have to contribute to button bloat. If they gave every class four new abilities from level 90 to 100 but you could afford only pick one of them (or had to give up one of your older abilities to get two), they could add a lot more flavor and explore more new ideas with the jobs in a way that isn't really possible right now without breaking everything.

It also gives SE more options for dealing with situations like Viper, where they think it's too busy and a lot of Viper players disagree. They can have different playstyles available to players depending on those players' preferences, with different builds emphasizing the parts of those jobs that people like.

I'm not really an "add talent trees" advocate because I think they would also add a ton of overhead and cause a lot of balance problems, but I do think focusing on the "it doesn't really add options because you have to just go with the meta anyway" part misses the point.