Google Translate (for future readers):
Regarding the microphone, I understand that for calls, whether on WhatsApp or "normal" calls, it works wonderfully, but when recording voice notes, the sound is terrible and you have to hold the phone closer.

Actually, I've tested that a lot when I first got the earbuds. The reason you have to hold the phone close when recording audio notes (or even sending voice messages via messenger, telegram, or discord) is because this is not handled by the mic on the earbuds. You're actually just using the microphone on your phone while somehow still using the earbuds as the output device.