turbine has a good track record of stopping small insignificant exploits then leaving a boss permanently unkillable in half of the runs you do for months/years. lot of people have come to dislike this priorities from turbine and these days its pretty common for the forumers whos been around for awhile to advocate only fixing buggs that "hurts" us players in getting a quest completed since they know even if they ignore half the buggs it can be longer then a year to fix key buggs.
to most people they dont really mind this exploit so when you suggest this they see all that dev time going into fixing each of these quests individually and slowly finding all the perch spots hurting pushing back the important bugg fixing like broken feat and key spells not working for well over 6months now. (im looking at you wail and combat archery)
myself i rather like the perch spot if we come to endfight and things go wrong (stupid team members im looking at you or if im very tired) then this is a good backuptactic i prefer over spamming sp pots.
if they try a blanket solution like the dungeon alert or similar then i just know they gona screw it up in a couple of quests and make them unplayable for a minimum of 6months and then the next update they gona break couple of quests again making them unplayable for 3months rinse and repeat. personally think the perching is lot less bother then any solution