Bluetooth usually seems pretty dang good to me. The other day I was playing a podcast from my phone on my Bluetooth stereo. I had an incoming call, and I was able to turn on and answer the call on my Bluetooth headset before the phone stopped ringing. When I ended the call, my podcast automatically resumed playing on my Bluetooth speakers.
I normally connect my phone to my car via USB, in order to use navigation, but it generally tries to connect using bluetooth too, and sometimes it plays the sound out of just one side speaker rather than in stereo for no apparent reason. And if my car is on and my phone is not connected using the USB, it continually launches Android Auto no matter how often I shut it down. So I concur with the xkcd, although I think the issue is more the overall OS than bluetooth per se.
As someone who in charge of testing BT enabled audio devices, reliability is terrible.
Ah, the good old days of bluejacking. Fun. Even if the person would not read the message, you'd hear his mobile ring. That was enough.
Honestly things seem pretty good to me these days- airpods are magical of course, but even my Taotronics headphones seem to reconnect automatically when I power them on, and when I connect from a different device they switch over smoothly.