Most specs don't work without weak auras? I mean I don't use it for Warlock (demo), Mage (all 3), or Shaman (ele/resto), and the only reason I use it for monk is because of stacking buffs that actually matter for fistweaving. I pretty consistently purple or orange parse without WA. You can call it "unoptimal" but it seems to work out pretty well for me. Maybe all these specs I haven't sunk any time into require it to "work", but I highly doubt that.
Look dude, I get that you want Bliz to make things the way you like it, I just don't get why you're against my idea of Bliz setting up a system so that it's a game WE like. Luckily for me, that seems to be what they are going for with the talent tree revamp replacing borrowed power. That's kind of the whole point of me bringing up talent trees, because ideally you'll have the option to do you, and I'll have the option to do me, and hopefully things are balanced enough that both of us can do it without seriously gimping ourselves. If you are finding your spec and rotation too easy and everything is boring, then maybe it's just the content you are doing is boring, or maybe you're just getting bored with the game itself. If we look at BC, we had plenty of people who weren't bored with almost literal one button rotations, and BC classic is pretty popular still. I need more than that to keep me interested, and you apparently need more than me, but I don't feel we should mess with peoples rotations every tier just to satisfy your boredom.
You're complaining about how tier sets have always been, because the goal of them has almost never been to change how you play, but to reinforce correct play. Legos are generally supposed to specialize you further into a certain style of play or also to guide you into playing your class appropriately (I can't speak for the shit legendaries, I don't know why bliz wastes design time on obvious garbage no one will use).