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> actually looked into all the dependencies of a Linux system and it turns out to be an extremely entangled monolith at the core

Any resources for this ? Most books I've read/seen are either about Linux kernel internals or using userspace Linux. I'd like to know more about what actually goes into making a complete usable distro.

Linux from scratch might be something you want to take a look at

Ever tried setting 'init=/bin/sh' on the command line? That gets you a shell (or any other program you care to run) and from there a little creativity is all it takes.

Systemd and a stripped down BusyBox would do it. That's what Alpine is, plus libmusl, minus Systemd.