They are useless for a very large class of users - it can be argued that those users should educate themselves more if they want to be safer, but it doesn't see

They are useless for a very large class of users - it can be argued that those users should educate themselves more if they want to be safer, but it doesn't seem escapable that hardware vendors (and others, including ISVs and network providers) have some incentive to promote solutions that have [what they consider to be] a better rate of solving the problem satisfactorily.