Ask HN: What would be in your dream OS?

I'm getting involved in hobbyist operating system development for learning purposes. I currently aim to, well, re-invent the wheel, but it would be fun to try something adventurous. Any ideas?

For things, I don't get around to doing, maybe someone more talented than myself could eventually pick them up.

Built in containerization.

Unikernels are interesting. Could patch a programming language’s standard library to be syscall independent in some fashion.