> Majority of people are capable of understanding warnings just fine
I think you overestimate the level of tech competency in the world, significantly, and this colours your entire take on this area.
I think people who want open devices should show their support by buying open devices, and leave the rest of humanity happy in their walled gardens
Look at non-tech related warnings targeted to laymen. Do you or your parents have trouble understanding most of these warnings?
I'm not saying better UX would help in all cases, but there's a huge heap of issues with security warnings from operating systems which, I think, are largely responsible for effects you're observing. If a warning requires that a user is tech competent, it's a bad warning.