But please do understand that if your reasoning is that you don't want ninjalooters "ruining" the loot - that concern is, by and large, born of a stubborn myth.
The one place where this breaks is people who dungeon log after ninja looting, log into the area after a time, and then the loot respawns "already touched". Whoever shows up afterwards will be very, very sad.
And logging off after taking all the (easily lootable) loot in a dungeon is unfortunately a very common exploit. The results of this are
very obvious by just looking at lootables throughout the dungeon.
Aside from your points, I think that ninja looting is generally a harmless action that serves to equip people that actually want to run content, as usually a dungeon will drop equipment useful for clearing it.
But we should probably stop the highest-end dungeons from being easily lootable altogether.