An actual air-gapped device is safe no matter how many times we use it for transactions but taking other factors into consideration especially human errs then better maintain a hot wallet where we store part of the portfolio that we have to use more often and a cold wallet that we have to touch only when we need that.
I agree with this, privacy is another reason why we should have a hot wallet even if we have an offline wallet. Your offline wallet is going to hold the majority of your funds, so it is bad for privacy to spend $5 on coffee from a wallet or address that holds 0.5 BTC. This is why having a hot wallet that holds < or = $100 is great.
At the same time, we have to ensure the existence of the wallet, status of the device cause electronics tends to malfunction while ages is pretty good practice to follow.
Even if your device malfunctions, you won't lose your funds if you have backed up your seed phrase well, either on paper or on a stainless steel.