I think it could be a capabilities issue. An ARM equipped Mac is a non-starter for me because my workstation is driven with a dock that has 2x 4K displays connected to it, ethernet, USB hub, etc.

I'm not willing to part ways with my 2nd external display and I'm sure a lot of professionals with my setup would also consider that a deal breaker.

They probably wanted to get something public so developers could start cranking out compatible apps ASAP so when the bulk start buying this hardware for production use, everything is fully baked.