Luffy001

As long as it's not inconvenient

It's not just looking old. If he "dies", he has to cut ties with all his close friends. It's the first time he has to do it so it's understandable he is reticent.

Yes, he cultivates useless health techniques (by their standards) so while they will help a little, his lifestyle (going to a brothel regularly, drinking) would make it worse. And he is so useless, maybe they think he didn't manage to cultivate the health techniques.

Or citizens. They just lost some untold privileges.

I think everyone saw that coming from miles away. Don't ever follow someone else's plan of betrayal, especially if the offer is too good to pass. It means you're a disposable pawn.

Wasn't it a fourth grade secret realm where Nascent Souls can enter?

It's wrong to think that way. Maybe she is a crazy sadist who enjoy people suffering. She can give him a bogus method just so she could laugh at him trying to breakthrough and fail.

I guess he can't comprehend the Dao too enough.

It's much worse

Yes but when you're furious, you don't think clearly.