This is more or less only (sadly) a problem with apple headphones.
You can switch the current microphone on Mac by ALT-Clicking the audio menubar icon. Normally MacOS will remember and follow your decision, except when you have apple headphones. For some stupid reason MacOS forces the headphone microphone on those.
Not true. I have a HyperX moc and it’s always the default, no matter what app I use. I have several Apple headphones, works that way with all of them. macOS 14.7 now, it’s always been this way.
Never had a problem using my Sennheiser PCX 550 (Bluetooth) with a Rode Video Mic Go II (USB). But when connecting my AirPods MacOS would switch the mic to them.
You can switch the current microphone on Mac by ALT-Clicking the audio menubar icon. Normally MacOS will remember and follow your decision, except when you have apple headphones. For some stupid reason MacOS forces the headphone microphone on those.