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RE: Do YOU have 2FA enabled? Do you use a password manager? The convenience of cutting these corners is NOT worth the risk!
You have just described how cold storage could be achieved in the old days - before hardware wallets existed.
For supported cryptos, a Trezor/Ledger will enable the same level of security as an offline computer used for signing transactions (which you would have to sneaker-net to an online computer in order to broadcast), with the convenience of creating transactions from an online device.