I don’t think anyone can make a definite statement about the fairphone 5 yet, since it hasn’t even hit the regular market yet. I’d say it’s of course possible that a connection comes loose, but at the same time it’s much easier to reconnect it. So it’s a doubly-edged-sword I guess.
As for the Fairphone 4 and given my recent experience with ghost inputs on that device I could imagine that a lot of vibration could make this specific issue worse, as it seems to be related to the physical degradation of the connection of the phone’s display and its main module.