I will surely use this software to turn my old device into a hardware wallet. My method of doing it air-gapped is very simple, you turn it off and don't turn it on until you want the funds out of it.
That's not how airgapping works, and your phone won't be airgapped just because you turned off the internet and other connectivity. You have to wipe the system first and reset it to factory settings. After that, you install this Knoq solution while configuring your phone, and you never go on the Internet again.
Very poor method to work with it but so far it's far better than my ledger. I lost the ledger once and also found it but obviously one could not forget the big old mobile device laying around which just lost.
You losing your stuff isn't a measure of the quality of those items. You can rightly argue you don't like Ledger for their closed-source nature, poor built quality, the database hacks, etc. But they have nothing to do with you misplacing the device.
It's like saying my new Nike sneakers are awful because they fell off my balcony. I don't like them anymore.