I can sympathize. It makes sense.

But...

As a veteran admin I am tired of reading trough Docker files to guess how to do a native setup. You can never suss out the intent from those files - only do haphazardous guesses.

It smells too much like "the code is the documentation".

I am fine that the manual install steps are hidden deep in the dungeons away from the casual users.

But please do not replace Posix compliance with Docker compliance.

Look at Immich for an unfortunate example. Theys have some nice high level architecture documentation. But the "whys" of the Dockerfile is nowhere to be found. Makes it harder to contribute as it caters to the Docker crowd only and leaves a lot of guesswork for the Posix crowd.