If you want to see the other end of the spectrum, this short video blew my mind. It shows the computer ROOM underneath the floor in the front half of a modern Airbus A350.
I know that Airbus planes are flyby wire and all that but I was astonished to see how many electronic systems and computers they have onboard one.
https://m.youtube.com/watch?v=LxS2RR-Vx_s