Apple has also shipped hundreds of millions of devices over that same time period, so the number of people with failed hardware is non-trivial. More importantly, it is extremely rare for people to perform root cause analysis on the actual failures which combined with the number of vendors and protocol complexity in the Bluetooth world means that a significant number of times the blame is placed on the wrong component.
The main thing I take from this is that vendors need to think about how they can provide a visible way to learn about peer device errors so e.g. your Mac could tell you that sound quality is horrible because the Bluetooth device doesn't support a high-quality codec or sufficient bitrate, is seeing high levels of retransmits or dropped packets, etc.
Like I had mentioned previously, if one side of the paired devices has a garbage antenna setup, it will have poor performance. Things like your soundbar, or a generic bluetooth speaker probably use reference designs for their BT setups and have not tuned them for the enclosure or use case.
this made me literally lol. my macbook pro is the shittiest bluetooth device i have ever used. just search google for macbook pro bluetooth audio issues, and you will find a slew of forum posts going back years. there's one terminal hack after another suggested just to try and get macbook pros to properly play audio over bluetooth. i don't even bother using my macbook pro these days to play audio through a bluetooth speaker. i just use my iPad or android phone.