I've seen this sentiment a couple of times here and I think it's the wrong framing on what the EU is trying to do. Third party app stores aren't the point; they're just a vehicle enabling users to choose which software they want to use without interference from Apple. The indie devs using AltStore PAL don't all necessarily want to use it, but they're forced to because of the way Apple chose to implement DMA compliance.
In fact, the DMA doesn't even explicitly require that gatekeepers allow third party app stores; they can only allow direct distribution (e.g. via web sites) instead, if they want (this is to the best of my understanding of the text, but IANAL).
When you say you don't care about alternative app stores, what you're really saying is that you don't care about the end user's ability to use apps that aren't approved by Apple. That is certainly an opinion that many folks have, but I'd prefer that they refrain from hiding behind the shield of "third party app stores are weird and who even cares", whether deliberately or not.