An edge case I come across quite a lot: entering a long, random password into a new device (where copy-paste is never available).

I just got a new TV and wanted to sign into my Amazon Prime account. Unfortunately for me, that meant I had to enter my 32-character numbers/lowercase/uppercase/symbols Amazon password using the TV remote. I did not get it the first time.

A few months ago I got a new iPhone. They wanted me to type in my iCloud password so that all my settings and data could transfer automatically to the new phone. Similar results.