Companies including Coinbase and Jack Dorsey's Block offer products that try to merge some of these ideas, creating a more secure version of a crypto wallet that remains convenient to use. There is Coinbase Vault, which includes enhanced security steps before a user can access crypto holdings for trading. And there is Coinbase Wallet and Block's Bitkey, which have mobile apps that work like a traditional wallet making moving bitcoin around easy, but with the ability to pair with hardware wallets and added security more commonly associated with cold storage.
Bitkey hardware requires multiple authorizations for transactions for added security, similar to "multi-sig wallets." Bitkey also offers recovery tools so one of the biggest risks of self-custody — losing codes or phrases needed to recover a cold wallet — is less of an issue.