I guess all programming is kinda hard, it's the nature of expectations of modern computing.
Per-process CSPRNGs are pretty common. Most programs don't fork without exec, no problem for them. Managing a per-process CSPRNG is only hard for libraries that might be used by some programs that fork without exec, and don't want to require the program to do anything right.
No! It's not hard, just don't screw it up. This is true of most things.
