Almost everything in this game is a participation reward and you can usually get everything without knowing what you actually do. Even savage gear glamour with the normal modes.

PvP has three armor sets and three mounts that are exclusive at the moment (yes with lots of reskins), do you really want to strip that tiny piece of content for a rated pvp mode just because you don't want to learn how to play it well?

What sense does rated top100 make, if you don't get rewards for it?

You get a datacenter split for the next season probably, so even less competition on your datacenter(2 times top100). If they add a method to only rank the top rated character of one account and make the reward accountwide you have like 10-20 people less too on the leaderboards.

I see each season completely new people making it. You can do it too next seasons especially.