Me trying to come up with two insults.

If we’re discussing Bluetooth that is entirely on the manufacturer to make sure it is seen as an external device instead of headphones if your device is showing as an external device and you are still getting that message then it is a bug with your phone.

But anyway you look at it a head phone port was designed for headphones exclusively and using it in any other way is incorrect , we have a work around it’s called line out and it should never go above line level line out is lower than a headphone port so the audio warning should not affect it at all if it does you are either not amplifying your audio correctly or the manufacturer made it incorrectly.

Devices used to have a dedicated line out you were never supposed to use headphone ports on external devices so technically you are just working outside of the standard, so technically your device is incompatible with all those external devices you are using, what we really need is a new protocol that is designed to keep everything at the same level on external devices.

TBF, if you’re doing it properly you should be using any exrarnal audio at line level and amplify it outside your phone to keep all audio devices at a standard level, it prevents some devices from playing too loud and some playing too quiet it also prevents clipping.

How’d you know little Alucard has Porphyria? She also has sleep apnea, we can only get her to sleep in a coffin for some reason, it’s really sad but not even the end of it she also has pica so she constantly craves blood.