

you can swap bash for zsh or ls for busybox without breaking the whole system
Is that so? rm -f /bin/bash and reboot. I’ll wait… Go ahead. You’ll be amazed at how many thing rely on bash. Or indeed sh which is why bash runs in bourne compatible mode when executed as /bin/sh.
The idea of Linux isn’t just about running big software, it’s about the ability to compose a system from independent parts.
This has never been true. The Linux kernel team themselves reject this silliness with a monolithic kernel that required a very specific toolchain to even build and run. Linux has always had tight integration.
We’ve had many competing implementations of some things (desktop environments come to mind) but that is not the same as “build a system out of Lego components” as a design goal. It’s what you get when you have no direction. It would be a very stupid design goal.


Asked and answered.