I do not switch between multiple devices often (mostly between my iphone and macbook, but no issues there, it was as simple as choosing airpods as the audio output on the device I wanted to use them on), so that's the scenario where I accept there could be something I've missed.

To Apple's defense, I don't think there is a wireless pair of headphones in existence at the moment that could handle that scenario better than them, let alone handle the switching scenario at all. I tried the hyped up Sony wireless earbuds that were released in August and promptly dubbed as airpod killers, and they do not support switching between multiple devices at all. Like, it isn't even a bug, it is straight up a feature that doesn't exist. If you want to switch devices, you have to reset the pairing and restart the whole process every time you want to switch the device. Returned them as soon as airpods pro came out, zero regrets.

I find it kind of bizarre that they wouldn’t use the same firmware/chipset as they do in their over the ear headphones. I have a pair of the Sony something-bass (model mdr-xb something or another) over the ear Bluetooth headphones and they’re paired with at least 5 devices.

The situation isn’t quite as dire as that with the Sony buds: you don’t have to forget and re-pair, you can just enter pairing mode on the buds and hit connect from a device that had previously paired, which is better but by no means good at all.

Yes, I wasn't complaining about Apple airbuds specifically, but Bluetooth in general.