Comment by wink

I think it also highly depends on where you're from.

Traditionally in Bavaria you'd have used "Du/Ihr" in shops or on the streets colloquially even decades ago, and yet from time to time you'd ran into people (always from Northern Germany) who seemed very surprised you'd not use "Sie/Ihnen".

Of course I'm overgeneralizing and I think I've had like 2 jobs in my life (since the late 90s) where some people were called Herr/Frau X instead of the just the first name, be it IT or not.