IIRC Android uses a regular Linux Bluetooth stack.
Also WRT your problems: In case you did not yet, switch to Pipewire. When I did that a couple of years ago, my BT Audio experience went from bad to really good.
It can be very device dependent, or even on which mode the device is in dependent.
For example, I have JBL headphones, that work perfectly in the A2DP mode; but switch to HFC for the mic, they will work for a few minutes, then drop off and stay that way until reboot.
That's with Ubuntu. With Android, no such problem.
1. It is GPL, so you can't change the license without permission from all contributors
2. It has lots of contributors. And now that I think about it I guess some of those are not even alive anymore to grant any sort of permission
Rocket engines are much more efficient at lower atmospheric pressure.
The bigger the nozzle the faster the exhaust gas. Efficiency is proportional to the square of the speed of the exhaust gas.
The bigger the nozzle the lower the pressure of the exhaust gas. If the nozzle is too big then the atmospheric gas goes into the nozzle. That’s the limit on nozzle size for sea level launches.
Starting high is better because you can have a MUCH more efficient engine.
Technically yes, but their policy and business value proposition to the end user says they don’t. it would wipe hundreds of billions of dollars of their worth overnight if it were ever shown Apple was secretly, willfully selling individual’s personal health information. Follow the money.
Also WRT your problems: In case you did not yet, switch to Pipewire. When I did that a couple of years ago, my BT Audio experience went from bad to really good.