OE is very much a thing in embedded Linux. You might also want to look up the Yocto Project.

I know that places like Formlabs use it (source: interned there), and 100% agree with the sibling comment: there's a huge, painful learning curve to get started.

It's a combination of a lot of problems: the question of what expertise level to write tutorials/walkthroughs for, decent documentation (that you think you understand but then realize, oh shit, no, I don't), knowing the ecosystems (man, the sheer F/OSS drama that you can discover while searching for something...), were all problems that I noticed just trying to extend our build system.