Completely anecdotal but I’m the only person I know who has a stock Debian install that isn’t a server, and it’s on a laptop that hasn’t been connected to the internet for the better part of a decade. I know people who use debian-based distros or use it occasionally for one thing or another (dev, testing, temporary,…) but at least in my experience, the numbers are approaching gentoo in terms of actual dailydriver desktop usage. I’m sure my experience is probably abnormal, but still…