Comment by saagarjha

Water dissolves pretty much everything too and yet we build structures that are useful even when it rains. Likewise, all software engineers get through their careers without learning most things. It’s totally fine, as long as they understand how to poke at a leaky abstraction when necessary. If atomic file renames is a performance problem for them, or it’s breaking hardlinks, or one of the several other ways that this would leak on them, then they can go learn what’s going on and update their understanding as necessary. Good abstractions aren’t watertight but rather don’t leak in unexpected and dangerous ways.