Windows on the front end and Linux on the backend isn’t uncommon these days. Big iron unix is expensive so it was largely moved off of, although there is still some Windows in the back end depending on vendor. I think Epic is Windows across all tiers.
A 401k lets you make money on the part that would have otherwise gone to taxes. Can you show an example with numbers where paying tax up front comes out ahead of paying tax at the end?
They think you are a ChatGPT bot