I feel like a lot of this is driven by a bias towards the unknown. You don’t know all the security issues in something new or even something old that doesn’t get the same level of testing as Linux.
I would trust security hardened Linux over all of the suggestions any day of the week. Better the devil you know.
Anything is better than nothing. This is true. But that doesn’t mean you aren’t wasting your time on something that does the bare minimum.