That seems like a great way to talk down to your end users, which seems like a security smell all by itself. Many users of F-Droid are technology professionals

That seems like a great way to talk down to your end users, which seems like a security smell all by itself. Many users of F-Droid are technology professionals themselves and are quite aware of the security implications of the choices they make for the devices they own, and F-Droid is often a component of that outlook. Further, I don't think it applies to the F-Droid maintainers, who routinely build hundreds of different Android apps for all our benefit. They even directly addressed his concerns about the signing key(s) and other issues by improving F-Droid and met with continued rejection.