I think Multisig is suitable for shared asset storage, but for private ownership I don't think it's really necessary. It would probably be safer, but if it's a personal asset it looks bad. I chose to establish and secure assets without multi sig. I just continue to be careful about my seed and privacy so that no one else even my own wife knows.

We also discussed this issue in local forums. There are a few options that I think we can make and are pretty safe. From the easiest to the least requires effort and of course I think it's safer. We discuss 5 storage seed or prifat keys options
1. Storing digitally
2. Writing on paper
3. Printing on metal
4. Carving in stone
5. With SS304 plate