I think the least realistic part of '90s cyberpunk was all the hacking on VR with literal object-orientation instead of on pocket supercomputers running LineageOS with a tmux shell.

This is how I plan to do it in my universes. All the fancy VR is going to end up locked down and proprietary, but they're going to have a 10,000 year old OpenSSH version with a weak default password.

Enter: tmux. Found on an ancient probe from the lost homeworld, key to the resistance.

You might think "but that's unrealistic! Surely they would replace it by then!"

Friend, let me tell you something. The first Mars colonies in 100 years are going to have a grizzled young COBOL apprentice keeping things running. They're going to know C++ and Golang and Rust, and your web portal will still use Ruby and Rails.