So, I just switched from Android to iOS, and I've noticed that the bluetooth reliability is significantly worse than what I've become used to.

I switch from a Pixel 4a to an iPhone 11, and both my Bose QC 35 headphones and Sony wireless earbuds are having lots of issue that I never head on the pixel.

So, my takeaway is that iOS is behind here, though I don't know enough about the underlying tech to say anything for sure. Just my anecdotal experience...