Over all the Fallouts that I've played from since the first one, only since Fallout 3(Bethesda taking over) has there been respawn rates. In my opinion respawn is one of the worst things in games, not only does it defeat those who are completionists who like to clear all places for good, but it makes it very immersion breaking and unrealistic. For instance, I clear one spot or loot an abandoned house, come back a day or two later and all of a sudden that house is fully restocked and those raiders are back in the same number, in the same exact spots. To me, once I clear a place, I like it to stay cleared, at the most some places could spawn but with fewer or stronger enemies, but only once or twice before it didn't anymore(ie. its considered a death trap and its would be avoided by enemies). Again, this is just my opinion, but I feel that in an infinite play game that random encounter spawns located throughout landscapes are more than enough to satiate those who continue playing after games end. I mean, if you do every side quest, loot every area, complete the game, and do all the other things that grant XP you are not going to need locations to respawn over and over to get experience and clearing the same place twice is just tedious. I suppose developers think its a way to keep people interested but for me it only makes me want to stop playing because everything I do means nothing as it will just come back in about 24 hours or close to it. You might think, well you can always mod the respawn so it never occurs, and that used to be an easy thing, but starting with New Vegas it seems like Bethesda has been trying to make it more and more impossible to stop respawns. In New Vegas, they placed event triggers and area triggers that would constantly respawn the enemies in certain areas regardless of your respawn rate. The only way to stop this was to go into G.E.C.K and delete them, but doing so would cause them to never spawn period and so you might miss out on certain things, so you had to do the enable/disable mod dance.
When Skyrim first came out there were two respawn counters, aside from the merchant list respawns, one for cleared locations and one for general respawns. In the beginning you could use the Creation Kit to set those respawns so high that they would never happen in a single play-through. However, this caused certain targets to be automatically marked for deletion by the game after their corpse sat for a little while with no respawn, which in turn would break several of the radiant quests which depended upon generic targets instead of specially created targets spawned specifically at the time of the start of the quest. Bethesda apparently realized this and must have hard-coded respawns into the game, as no matter what I've done with the main respawn rates, it seems to only affect containers, as objects in most areas as well as enemies are respawned after the base period of time. I'm not sure how difficult Fallout 4 will be to stop respawns since the G.E.C.K won't be coming out till a few months into next year, but I would just like to throw out an idea to Bethesda to just remove the respawns as they are. Fallout 4 has seen the coming of many changes to Bethesda games as we know them, especially Fallout, and we've also seen the removal of things we've come to know(Skills, Karma-which I kind of miss, etc.), so why can't we finally be rid of respawns once and for all as well? I know there are probably many people who might disagree with me, and that's fine, but are there any others who feel as I do? Sorry for the long rant, but I felt I needed to voice my thoughts after seeing the 'abandoned' house I looted for the fifth time respawn once more after only a few hours, and I hope possibly something might come of this.