This upgrade will break any 32 bit iOS apps you might have on your device, and you have absolutely no recourse and downgrading is not permitted. I've lost access to several _paid_ apps due to this.
How many apps are really still like this? Surely it would be better to pay a few quid to developers that keep their builds current? Or are you bothered because you can’t use a £1 app for over eight years or something?