The use case for sshfs that you can quickly get access to all the files accessible to you in some machine without needing to be root either local or remotely.

I have had very stable networks for over 10 years in most of my work, so I don't think I haver ever suffered from hangups.

It does not fail gracefully when you read or write bigger files than your connection can decently handle. But I don't know which system would behave better under such conditions.