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It is encrypted, but there is a significant difference: for Hive Keychain you need to store your private key somewhere to be able to import it. You need to write it down or copy it from your notepad or key vault, or whatever. You're using your private key in a digital form somehow and you might be a target for some digital thefts. When using a hardware wallet you never receive your private key - it never leaves your hw device. The device stores it and use it to sign transactions.

True.

It is very useful and good to have it as an option on hive.