Wireless earbuds microphones are famous for poor quality audio, even in the top of the line models. The microphone is indeed closer to your mouth, but the sound in the human speech range is quite directional, and does not travel to your ears as well as it does to a microphone in front of you.
Not to mention the quality of the parts itself is usually much lower than those in the external mics, or the MacBook ones for that matter.
There's a YouTuber called DankPods, reviewing all sorts of headphones lately, along with their mics. Can't recommend any particular video, as the microphone tests are only a tiny fraction of the content, but after watching a few tests this issue become very apparent. Easiest thing to do would be, as other commenter suggested, to test it out for yourself in the voice memo app.
Not to mention the quality of the parts itself is usually much lower than those in the external mics, or the MacBook ones for that matter.
There's a YouTuber called DankPods, reviewing all sorts of headphones lately, along with their mics. Can't recommend any particular video, as the microphone tests are only a tiny fraction of the content, but after watching a few tests this issue become very apparent. Easiest thing to do would be, as other commenter suggested, to test it out for yourself in the voice memo app.