One of my fav tech talks ever (and I watch a lot of tech talks) is Alan Kay's "Is it really 'complex'? Or, did we just make it 'complicated'?" It addresses your question directly, but at a very, very high level.
Note that the laptop he is presenting on is not running Linux/Windows/OSX and that the presentation software he is using is not OoO/PowerPoint/Keynote. Instead, it is a custom productivity suite called "Frank" developed entirely by his team, running on a custom OS, all compiled using custom languages and compilers. And, the total lines of code for everything, including the OS and compilers, is under 100k LOC.
https://m.youtube.com/watch?v=ubaX1Smg6pY
Note that the laptop he is presenting on is not running Linux/Windows/OSX and that the presentation software he is using is not OoO/PowerPoint/Keynote. Instead, it is a custom productivity suite called "Frank" developed entirely by his team, running on a custom OS, all compiled using custom languages and compilers. And, the total lines of code for everything, including the OS and compilers, is under 100k LOC.