But saying things like "everything is somewhere in the middle" and "use common sense" is just as much marketing speak. It's meaningless to the point it's very successfully used in both marketing and politics (but I repeat myself).

The key thing is you can set the parameters so that whatever you're selling happens to fall squarely in the middle. And of course anything can be common sense so long as you can successfully ridicule the alternatives and describe your solution in a way that sounds plausible(ish).