With the revelation of Pegasus does that mean phone wallets can be compromised so easily?
Well, phone wallets aren't bad because of the security they provide. It has to do with the operating system. For example, Android isn't open source and since everyone uses it, there may be weaknesses that only Google can take care and is aware of. I guess, though, that it wouldn't have any difference if you used it as an airgapped device.
It is correct what you are saying, but when I were to ask you to give a guess how much % of cryptocurrency wallet users use a hardware wallet or a wallet on airgrapped device, what would be your guess? I believe that number may not even be double digit. If you take trust wallet as an example, Pegasus should be able to crack that or not?
I'd guess that around 15% of the Bitcoin users use open-source non-custodial wallets. (hardware, paper, airgapped etc)