I am generally for player convenience - with Larian's large singular area I think they need some form of fast travel. Just recent I wished Disco Elysium has some feature as soon as the map opened up. I am not sure, however, if I like the rune thing - it doesn't seem to fit.
Camp even more so - resting is same generic area, no matter where your party is, is jarring. I agree with OP that something like Kingmaker would be great, but I am not sure of devs want that - they want their camp to be more then just a sleeping place.
What I would suggest is something similar to diablo. Camp IS set in a certain area, and we need to use magic consumable items to get back. It could also be used to limit amount of resting available when adventuring (ala PoE1&2). Camp would be act specific and would makes sense - followers and spare companions wait there. Back to camp teleport would work both ways - you go to camp, and then teleport back to where you came from. Ideally, camp would be a spot on actual map - rather then existing in its own plane.
As to world quick travel - something needs to be there, but I would prefer something more relatable then runes.
