Why can't they just make all mana users resourceless?
Mana users already suffer from being resource-gated when their AD counterparts have infinite resources, without a measurable difference in damage output. Why not just cut the cord on the whole concept of "mana" and make them solely cooldown or energy based?
Even without mana, "mages" and "assassins" will be clearly distinct in terms of how they help a team due to their different kits. There isn't a reason to gate people by mana anymore, it's clearly a dying beast. Put it to pasture and level the playing field.
So...can you please explain to me how mana is a "dying beast"?