For ~20 years now, basic USB and WiFi connection have been in the category of “mostly expected to work” – you do encounter incompatibilities but it tends to be unusual.
Bluetooth, on the other hand, seems to have been “expected to fail or at least be flaky as hell” since Day 1, and it doesn’t seem to have gotten better over time. What makes the Bluetooth stack/protocol so much more apparently-unstable than other protocols?
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One of the reasons bluetooth has gotten better over time relates to improvements to microprocessor performance.
Modern mobile devices have more processing power which allows for more sophisticated data compression algorithms. These new algorithms allow for bluetooth data to travel longer distances using less power without dropping packets, while also freeing up a device’s processor to perform more complex operations related to noise reduction and other stuff. The Bluetooth spec was just updated last year actually with some significant improvements, so you’ll soon see much less flakiness in Bluetooth performance (especially related to audio) provided you’re using a modern device which supports Bluetooth 5.3 and above.
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