Lots of luthiers use bolt on necks these days. Lets forget about the idea that bolt on necks means the same as flat pack furniture packs, luthiers will make sure that there is the same attention to detail with how the neck is attached as to the way they do the struts or anything else. A dovetail done badly is no where near as good as an interference fit with a bolt. Either done well will work, neither done well won't, but for maintenance, the bolt wins.