They know macOS as an "easier alternative for normies"
Questionable amount of knowledge for techies if they aren't aware that MacOS has a nearly full-blown FreeBSD inside. Then again, discourse on Reddit and Lemmy is the same way. But a lot of webdevs love MacOS, which also leads to tons of open-source utils for it, which I don't have to download as binaries from a site last updated in 2016.
There's a sorta-famous photo from CERN, from early 2010s, with a room full of folks who work there, all with Macbooks. A dude I know went to CERN sometimes for his university, and came to me with a question of why he's seen so many Macs there. I explained that it's a Unix but with a GUI made for people.