It doesn't mean that people don't review the code, though. You still can't ask Linus to merge a million-line patch, even if it works.
And more importantly, documenting Mac hardware takes time. Components like the speaker on a Macbook can be permanently damaged if you don't write the drivers in a specific way. Other features like the Secure Enclave, power management, and TouchID might be unsupportable depending on how Apple designed it.
Asahi's stance isn't particularly crazy, and it probably aligns with how Linus feels about upstreaming code that nobody understands.
TouchID is already supported on Omarchy, I use it on my daily driver MacBook works great. The speaker too.
It is quite remarkable how far along support has come: https://aurorasilicon.org/devices/
I think the other factor is all these additional projects are starting from the work Asahi has done, whether they're actually able to deliver substantial value themselves is yet to be seen, especially safely and securely.
Personally I don't think it's very likely the tables would turn and Asahi became dependent upon their contributions. I foresee a much bleaker future for Omarchy, crashing and burning from some reckless and unnecessarily abrasive whim of DHH. I'm not optimistic about Gravity Linux either, it's a single-dev project and that's prone to failure for many reasons.