Generally, I still subscribe to the Sparrow Wallet best practices.  Though, I'm not married to the amount thresholds.  In short, I still think a paper seed for a singlesig wallet can be perfectly appropriate depending on the situation.
 https://image.nostr.build/fe0e229d1cd014578bbfe732af086d60b7b60cd9fbd368b6d1d2fb6e03d37296.png 
https://sparrowwallet.com/docs/best-practices.html#summary