Not sure that really answers my question. I'm aware some apps won't work. But my colleague told me there were reports of random app deletion (with the suggestion that apps that should work are being deleted by some glitch). I was trying to find out if that was true, or if like a game of careless...
Haven't updated yet. Someone at work mentioned something about reports of apps disappearing when you upgrade. Is that one of those 'purple monkey dishwasher' things that started as 'some apps won't work because they are removing the 32-bit support' and evolved into 'iOS 11 deletes random apps!'?