Makes no sense to me too but there is a vocal minority, as demonstrated when Microsoft removed android app support from windows 11, that use them. It's hard to estimate how many dozens of them there are but I guess it got to be in single digit.
I use Chrome OS and I use exactly three Android apps: VLC, Deezer and Tailscale.
A video player is something I literally just watch, a music player is the sort of thing I'm happy to have in a phone-sized window, and a VPN client is of course not the sort of thing I interact with much at all.
I never once ran an iOS app on macOS as the UI/UX makes no sense even though it is possible.