I mean the idea would be to remove all such systems, not keep them all over time, and stop adding them. It's how wow used to work and how FFXIV does things too. In XIV you have Beast Tribes factions, and basically all they gives is cosmetics(transmogs, pets and at the max level a unique mount) and sometimes crafting materials(especially the crafting tribe gives materials needed for endgame crafting for a while, so everyone doing daillies can make some good money out of them). Oh and xp, they're good for leveling alts. The "point" of them is mostly the story of each tribes, and at the end of the expansion there's an overall story to all the tribes added too. But that's it, if you don't want to do the daillies, it doesn't matter, you don't lose anything. There's also only 3 tribes per expansion(5 in the original) and a cap to daillies from them so you only ever spend like 15mins doing them, versus an hour and a half doing world quests all over the fucking place(pre flying, which is when you mostly want to grind them anyway, while again in XIV, you can fly after you've finished the zone).
leveling in legion is fast. If you catch a zone invasion its bonkers XP. Legion is just below WOD for how fast you can burn through it now if you want to.
A lot of them were great though from what I understand. Some not so great. There is some new ones too, forgot which site had a list with the sources and a few were from Torghast anima effects rather than legion legendaries.
