You know what?
I fear the devs would think that this would be a great idea.
The biggest issue is that they are hell bend on balancing the shit out of the game.
Yeah, yeah, but rAiDiNg AnD nEw PlAyErs.
I don't care. Exclude raiding from this.
Cap my stats for duties, allow me to have my full job kit in all instances, and give me gear with stupid effects that would allow me to have an infinit manapool for BLM so I can run around and nuke everything.
Give me gear which reduces my gcds to 1sec on melees.
Give me an effect so that my healing skills apply buffs.
Then give me an endless dungeon akin to DD, with an ever increasing difficulty and let players loose. The further they progress, the more, idk, tokens they earn to exchange for whatever gear they want.