I gotta agree that a properly set up Linux box is a far better option (for almost everything) than a standard Windows set-up.
Unfortunately I have found through many years of trying to convert people to Linux that unless people grew up with a command line interface that trying to get them to give up on their familiar 'double-click does everything" is near impossible.
People fear the unfamiliar. lol.
I did grew up with DOS. But command line doesn't work for me of a phone. It will not read QR code... And to properly setup a linux box takes more time then standard Windows setup. Well at lest last time I did that took longer but I must say I didn't to that for a couple of years now. But anyway we are talking about using on-line bitcoin core in a safe and easy way as a wallet compare to Trezor and MyCelium(EDIT: and running a core without using a wallet). I really can't see how you can make that safer. Even if only your connecting device get compromised you are in trouble.