>If the “quick call?” method is common, it means that many of its users don’t want their communications logged, meaning they commonly ask for sketchy stuff.

In my experience, the reason for most "quick calls" isn't quite this nefarious. It's usually just about making a request for which the asker wants immediate confirmation of handoff, and/or for which they haven't done much thinking or built a good justification, and they are proficient at controlling synchronous conversations to avoid questions and clarifications while still getting to yes.

/cynicism And, there are plenty of people out there who genuinely do prefer the personal touch and talking to others.

The cynic view is so true. Quick calls are so often made to not have to meddle with actual requirements, and indeed to have the freedom to change the requirements in a future "quick call".

I mean conversely you will absolutely get advised by lawyers to not use email for discussions about things which might be litigated. But this happens at any scale: it's evergreen advice.