So regardless if anything, should you store them in a hard wallet?
If yes, and the world changes in terms of blockchains, splits etc isnt there a chance your offline keys can be worthless or problematic to cash or convert in the future since you stored them one way back in the day and now things work differently, code is different etc.

Also if you don't control your key anymore, what does that mean then to me?
What is the best offline hard wallet recommended?