Ever since 3 came out people have been complaining that you can carry too much ammo, too many stimpacks, heal too easily, and fast-travel because they lacked the ability to keep themselves from doing so.
I wouldn't say that's it, people complained about it in Oblivion too. Of course it wasn't that people could control themselves, it was the fact that some quests had you going back and worth across the map a few times, which would make it annoying not to fast travel, even if you hated the concept.
No one is forcing you to play hardcoe mode, and if it makes people happy what's the problem? I always eat and sleep regularly in game with FO3 and the TES games, but it's nice to have it be built into the game too.