If a computer is pre-installed and working, 90% of the problems are solved already.
That’s a fantasy solution to a real world problem. Computers will never come with Linux preinstalled in large numbers. Even if they did, they’d come with a shitty distribution filled with adware that you’d want to reinstall anyway.
Installation of Linux on an already existing Windows system is an important problem that needs solving, and it feels like we barely made any progress there in 20 years (anybody remember umsdos?).