This may be true once your tank is already stable to where you want it to be. Prior to that I think is where you spend so much time figuring out to balance everything.
Agreed. For me the whole point in not having to do PWC's would be so I could leave the system for sometime and just a friend feed.
To not have to do water changes but still have to do all kinds of testing and dosing the appropriate stuff, etc it's just as easy to pull and replace 5 gallons of water every few weeks IMO.