I want 2.2 to be a "reset" for players in full i90 gear. Make Turn 6 a distant goal.

[synaesthetic]

Which would nullify the point of CT and DL, congrats you just destroyed half the content in the game, yay!

Actually, Yoshida designed it this way on purpose. FFXIV is a "vertical progression" MMO. That automatically means content will become obsolete, especially when the level cap is increased.

No way around it without completely redesigning the game from the ground up.

I don't think you get how it works. When a level cap raise happens. The item level of 51+ gear will be higher then anything that was equipable at 50. Say the last raid at level 50 gives you ilvl 200 gear, then the first piece of 51 equipable gear will be 201+. This is exactly how it woked in every other mmo with ilvls. Your quest gear while leveling up to the new cap beats out any previous raid gear that was at the old cap.

Uhm... no. This would create absurdly ridiculous levels of power creep. We all saw what happened when Blizzard did this with Cataclysm. HP pools went from 25-30k to 120k+.

Properly done for a vertical progression game, the drops of the new expansion's very first raid should be equal to the power level of the drops from the previous endgame's most difficult raids.