I'm not asking for anything beyond proper access.

Your "they" is ambiguous so that I interpreted it as Apple needing to spend extra time.

You interpreted that word correctly. But I would say that part of "proper access" is that it needs to meet basic interoperability levels. That much is Apple's job, and it's not a very big job.

I'm not asking for them to do any work beyond that level for non-Apple devices. If those devices need to run fancy code to make the feature work, that fancy code isn't Apple's job.

(But if the feature just needs to listen to the microphone feed, then I do expect it to work out of the box with any headset. (The firmware updates they're doing to older airpods are not clear evidence one way or the other whether it actually needs on-headset support.))