&gt; I don&#x27;t really understand how the computer systems of the F-15 and F-14 which were written in 1970&#x27;s and probably in assembly seemed flawless yet with todays tech we can&#x27;t even do this?<p>Programming languages haven&#x27;t evolved much since the 70&#x27;s, yet the number of lines of code we have to write to fly a 5th generation fighter jet has probably followed the same curve as the number of transistors inside it. And scaling a CPU turned out to be easier than scaling a program. Imagine the difference in complexity between the earliest computers controlling car engines, and what the computers inside a new Tesla are doing. 
The same with jets. Modern jets can barely stay airborne without a lot of computer power.