Yes, you can certainly use an air gapped laptop as a dedicated hardware wallet.

But now you need to generate a public key to send to someone so you can receive coins. How are you sending that key to your friend? Are you going to read character by character and manually type up the string?

It's all tradeoffs.

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lokar an hour ago | parent [-]

For the public string? QR code

	▲	coralreef an hour ago \| parent [-]
		Right, so now you need an additional device on hand (your phone) to parse the QR code into a string. Or I guess you could activate your hot laptop's webcam, pick up your cold laptop, crank the brightness up, point it towards your webcam, and capture the QR like that. Sounds kinda clunky.