I like your ideas, however like with everything else the community will figure out what pushes the most dps and anyone who does something other will be alienated. From your MT/OT perspective will the OT class get damage buffs over what an MT spec can pull? If that’s the case we go right back to the issues we had in SB and HW where you spend as little time in a tank stance as possible. How would tank swaps be handled if the OT wasn’t spec’d defensively to be able to handle the tank busters. It adds a lot more variables to a system that’s pretty static in the name of adding flavor or complexity, which in itself isn’t a bad thing. It just doesn’t work well in our current endgame environment.

In terms of say.. AST as you brought up. You could spec into regens or shields. Can you change this on the fly? Regens will stack but shields don’t causing compatibility issues if you get noct ast/sch or double noct sch in a roulette.

As a whole the meta of nin/drg/brd was broken up (buff nerfs, removal of piercing debuff, ast rdps lowered etc) in an attempt to curb any kind of required classes to bring for a raid. Adding in a mix of extra support/buffs could break this again because with our current environment dps is king. There’s no meaningful way the game tests tanks or healers outside of tankbusters and raidwides so we’re left with pushing as much dps as we can to push phases and clear faster.