Why you expect weaker hardware to uses more libraries and programming larguages than today?
Makes no sense. On weaker hardware we had back in those days you had to work as close to the metal as possible.
The multitasking, multi-user system known as UNIX was built on and for the PDP-11. The PDP-11 was only 7x larger than the NES.
FORTRAN 77 (from 1977) is roughly contemporary to the PDP-11, as are many other languages still in wide use today.
Back in the day, compilers, interpreters, and virtual machines were all things that were regularly used... and state-of-the-art computers were smaller than you'd expect.