There are many types of "John"s out there. I worked for a John who was a highly accomplished engineer. It doesn't make it any better to have someone constantly micromanage you knowing that they are technical, it only makes it worse because you have to think to yourself "he might be right". But the thing about micromanagement is that it doesn't matter if the micromanager is right or not, it simply kills employee motivation to know that any energy and thought they put into their work is likely to be overruled based on a whim.