Owning a Mac has always meant not relying on 3P software. Forget printer/scanner drivers. Even if they target macOS perfectly, there will come a day when you need to borrow a Windows PC or old Mac to print.
It happens to be ok for me as a SWE with basic home uses, so their exact target user. Given how many other people need their OS to do its primary job of running software, idk how they expect to gain customers this way. It's good that they don't junk up the OS with absolute legacy support, but at least provide some kind of emulation even if it's slow.