Let's try to think from the SE view:

If SE make a lot of easy NM spawn 21hrs with incrediable equipment so player want to camp it...

-> EU players, US players, JP playsers will camp it try to voke it, a lot of frustration from loser but eventually some hardcore player will get it.

-> Hardcore will prove they're good by equiping it, also sell extra copy on AH/Ward with expensive price

-> Most Player who can't camp the NM will try their best to buy the rare drop, try makeing gils by crafting, farming, grouping with LS to fight HNM, event, to gain gil... or even skip the whole thing and buy gil on the web.

-> then a lot of RTM player will show up and camp for it,

In summary, hardcore player will play, regular player will play, RTM player will play.

Who benifit? SE and the whole community becuase a lot of player keep online to make the game more lively.

So, Why not ?