The threat is that users who are not sufficiently tech savvy will shoot themselves in the foot, including using methods they don't understand. This is a pattern we've seen play out numerous times. The more secure platforms are overwhelmingly the ones that protect the users from themselves, and (most) users value security over absolute computing freedom.
> The more secure platforms are overwhelmingly the ones that protect the users from themselves
More secure by what metric? I would expect that by definition, they are equally secure until the security settings are disabled. If the user disabled a security setting, of course that system is less secure, that's a choice the user made in exchange for some other benefit.
> (most) users value security over absolute computing freedom.
How do you know this? I think that if they're disabling security settings, it's probably because they value freedom/capabilities over security. And you may think this is the wrong choice, but it's theirs to make.