And I thought I was the only one who's kept everything since day 1 in Bitcoin. In addition to what you said, keeping all your private keys, seed phrases etc., is important because you might need to sign a message from one of them someday. I know, it sounds very improbable, but not impossible. Somewhere, at some corner of the Internet, you might have posted an address whose owner is wanted. Or someone might try to impersonate you, after 10 years or even more. Signing a message from such address can be an emergency.

And ultimately, it costs practically nothing to store a wallet. Even if you don't bear in mind the above, you gain absolutely nothing by freeing up the space a wallet takes (in both physical and digital formats).