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You only need to input the seeds + passphrase in case you want to restore the wallet.
For everyday use, you will only have to unlock the wallet typing the passphrase.
Yes, with model One, there’s a risk when typing passphrase on the PC keyboard, BUT even if your passphrase gets compromised, the hacker still would need the seeds in order to steal your funds.
The model T in the other hand, allows you to type the passphrase directly on the device.