You sound like you have the rarer, nice landlords with maybe a handful of properties that are being rented out. These are the landlords that as long as you pay their mortgage and provide little fuss, they are happy and not trying to constantly maximize their returns.

I'd imagine your scenario would not be the case with a typical management company. While your scenario is attainable for a small amount of people, it would be difficult to see happenning for the masses.