More world NMs yes, please.

Long respawn times? No.

Horrible drop-rates? No.

I am ALL for interesting NMs such as weird spawn locations, conditions and the like. But XI's NM system was pretty terrible for me and lead me to almost never utilizing the content. XIV? I've camped pretty much every NM, and the drop rates are bearable mixed with the fast respawns.

I do think that content for people to compete for should exist if there are people that want it, but please don't make the entire game that way. One of my biggest dislikes about XI was the inability to just decide you wanted to fight something, but you might have to wait hours or days only for a chance to even claim it, let alone fight or kill. I want to see more challenge focused in the actual defeating of monsters than simply in claiming them.