If you always want docs, you just install the `docs` meta package that will pull in any `*-doc` package for anything else you install.
I think you can achieve the same thing on bare metal by being careful to tell it not to install a bunch of base package sets.
Alpine is more container-focused than debian, so I imagine they default to something closer to `-slim`, but I haven't tried installing it on bare metal or in a VM.
I'm not sure what you mean by apt being stripped down. You get the normal apt still.