100% This.
I feel this way the most about electric water heaters. Why the heck do we need an inspection on an electric water heater replacement? If it's existing there, why not put it back the way it was?
Maybe the homeowner can't afford all of the bells and whistles that comes with an inspection, and then guess what happens? They tell you to #@$^ off, and then they put it in themselves, maybe in an even more unsafe manner than was there to begin with.
I know this is not really taking into account all of the scumbags out there doing subpar work and then running away with ma and pa's savings account, so there's THAT.