I see two completely separate issues here that I have a problem with. I'm speaking in general terms here and not specifically pointing fingers at anyone, merely trying to express a personal view.
Personally I don't really pay any attention to persons comments when ALL they say is "I do a water change every X weeks/months/years" and the person doesn't mention much else about their tank. Water changes are only part of the overall picture. Other things that need to be considered along with water changes is the size of the tank, the tanks inhabitants, the bioload in the tank, if it has and sort of reactors, skimmers, top-off systems, sumps, refugiums, mechanical filtration, chemical filtration, live rocks, type of substrate etc. Each system is set up different and it's the complete set up that allows for some people to do water changes less frequently then others. If I had a 120 Gallon tank with a pair of clownfish in it, I wouldn't expect to have to do water changes very often neither. However if I had a 20 gallon tank with the same pair of clownfish in it then I would be a lot more inclined to do more frequent water changes because the bioload to water volume has drastically changed. There are a lot of ways for nutrients to be exported from a system that don't include water changes and also people add nutrients at very different rates which requires a different approach to tank maintenance.
The second issue that I have is when an LFS employee tells someone who is just entering the hobby that they only do a water change every X months/years and their tanks looks wonderful. I think that LFS employee is doing the new comer and the hobby a big disservice because he new comer doesn't have the practical experience to keep a tank healthy long term without regular water changes and if they fail it reflect badly on the entire fish keeping community. Once they get familiar with their system and equipment and the animals they are keeping then they can start to change their maintenance schedule to match the tanks requirements. I think it is really important for LFS employees to explain that every tank is different and although I only do water changes every X weeks/months/years that they came to this stage in tank maintenance only after they understood more about keeping their tanks.