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There may be a reason for that, but I cannot remember. Maybe because the named pipe was not configurable, and most applications did not support docker contexts when the decision was made? @proud-jewelry-46860 Do you remember?

So much history! As mentioned, I'm so surprised how much docker toolbox workaround is having to be removed from DDEV!

I'm still confused (I don't have a Windows machine with Docker Desktop): Does

docker run -v

and the docker-compose file still support MSYS filenames. And does the support depend on

COMPOSE_CONVERT_WINDOWS_PATHS

or is it always enabled?

COMPOSE_CONVERT_WINDOWS_PATHS only affects compose's behavior, but if on, Docker Desktop supports the MSYS-style paths for mounts. I doubt I would implement support if I were you. It does seem like it's only for toolbox (and WinNFSD)