I think you're right that legacy, mindshare/knowledge etc played a big part in it, and I'm sure Windows is much better with this stuff now. Although the handful of studios I've been to in the last few years were still running Macs, but again maybe that's just mindshare.
A funny thing I realized recently while trying to setup OBS for video conferencing on my Mac at home (I work as a teacher occasionally): There is no way out of the box to capture system audio, you either need to do it through external hardware or use a hacky solution like Loopback. On Windows, this "just works".
In other words, you and OP may both be right. Three absolutely massive transitions at apple between your era and theirs: hardware, software and management quality.
Your bad luck was that you bailed out of the MacOS audio subsystems just when they started to get good.