The other headphone still function on iOS. Connectivity to devices is just one feature of many headphones compete on. Sound quality, noise cancelation, design, comfort, etc. If I want the absolute best sounding headphones no matter what, it doesn't matter one iota that AirPods connect seamlessly, I'm still not buying them.
Bluetooth pairing was a complete cluster for decades before Apple finally fixed it, and now their reward for doing so is "the companies that didn't spend the money to fix it get to benefit because the government says so." So Apple just did free R&D for every other headphone manufacturer. For now on in the EU, if Apple solves a problem like that, their reward is immediately giving it away to competitors for free. Which will absolutely harm innovation. I'm 100% fine with Apple not having exclusivity forever. Say Apple gets to keep the feature to itself for a few years and then has to open up - that gives Apple time to be justly compensated for its innovation. But immediately give it away? That's, IMO, ridiculous and the fact that the government thinks like that does a large part to explain why EU tech companies have such a hard time competing.
What laws like the DMA ultimately say is "Apple isn't allowed to compete in the areas they do best, because they're too good at it". Many of you think that's ok, but you're never going to convince people like me and
@I7guy that it is ok or that it doesn't harm innovation.