Is TP interesting as a mechanic?

[Khalithar]

TP isn't optimal, but it works the way it is; and it'd be potentially confusing to existing players to introduce new resources for individual classes. Not to mention a headache for the devs to alter entire class trees around generating/consuming a new resource.

Not that confusing honestly, Blizzard did that as a means of making some of the easier classes a bit more interesting even though they had been without them for years and in my opinion it worked. It added some new combat options and they added cooldowns later on to work with those resources. So I adamantly disagree that adding some new resources systems would be too confusing, I think the players will adapt and get better and see that it's better in the long run.