From an end user perspective, I think the best thing the Asahi team could have done was solely focus on getting the M1 Air/Pro working 100% before moving onto other devices.

But that would probably result in burn out from the crazily talented dev team :P

Asahi focusing on M1 would also encourage secondary market sales of M1 laptops, which are already a primary competitor (see Apple marketing) to current Apple laptops. If Apple wanted to encourage Asahi Linux users to move from M1 or Qualcomm to M5/M6 Apple devices, they could improve device firmware compatibility with Linux, or contribute directly to mainline Linux.

Considering that M1 and M2 are almost the same architecturally isn't that exactly what they are doing? M3 are two new contributors who decided they wanted that.