Have ridden in many places across the UK and have only seen people wearing knee/shin protection if riding DH or are a “Mr Safety” type.
Recently moved to Stockholm and it is de rigueur regardless of ability or riding style. The terrain suits it as we ride 50% of the time on big bits of exposed granite. There are no long 30 minute plus climbs so you’re rarely spinning and sitting in the saddle. It’s mostly pedal kicks and pumping.
That said, I’d feel weird not wearing them in the UK now as I am so used to it.
Agree that the fit is never good. Your knee flexes a long way and even the nice POC ones are a bit annoying after a while.
Protect your knees!