On a non Linux OS that should be offset by being able to allocate RAM separately to each container instead of the current approach in Docker Desktop where a static slice of your system memory is always allocated to the Docker VM.

This a feature targeting developers or perhaps apps running on end-user machine where page cache sharing between applications or container does not typically get much of RAM saving.

Linux kernel overhead itself while non-trivial is still very manageable in those settings. AWS Nitro stripped down VM kernel is about 40 MB, I suppose for Apple solution it will be similar.