I think that's unfair to audio developers. You're asking for a real-time scenario from an obvious not real-time OS. Dropping audio is a lot more obvious than dropping video frames. Audio also deals with /a lot/ of plugins both hardware and software--many paid (years ago and now abandoned). Most people I know with an audio setup are very sensitive to physical changes due to subtle problems.

I also think it's unrealistic for large applications to be 100% ready on day one. It's not like Apple has a GM ready weeks ago. Betas are known to change and nobody really knew when Catalina would ship (many people are surprised they're shipping what they have).