Batteries are likely to degrade over time, meaning you’ll eventually end up with a worthless ear bud on the left or right and the only solution will be to throw them out. These things are often pretty bad scoring on repairability metrics, and I can’t even blame the companies producing them here because they’re so small.

I'm hoping these start getting recycled for their batteries, like the EU has plans to do.

Anyway, I feel full size wireless headphones are somewhat less problematic as they have bigger batteries, and you can always fall back to wired use (in most cases). But the proprietary app concerns are definitely valid.