It's simple, I can buy some IEMs that sound better, cost less than a third of a barely-even-comparable wireless earbud, and roughly conforms to market standards so I can swap out the cable and tips. And I never have to charge them.

I have a pair of Airpod Pros that I use solely for audiobooks and podcasts when I'm doing chores or shopping, but the audio quality is so garbage that's all they're really good for.