For a given value of clean and in the long run, yes. But there are specific cases where letting the tank go prolonged periods without water changes replicates the dry season for the fishes native habitat and is necessary to induce spawning. Ammonia/nitrites are still processed by bacteria, but nitrates and other parameters go sky high.
I'd say the only hard and fast rule is 'there should be water in the tank'. Everything else will come down to the species involved and the desired outcome. Sometimes people aren't willing to put in the necessary work to get the desired outcome, and sometimes they don't know what is required to get to the desired outcome. I think this is where it's important to understand that there is not one path to a successful aquarium, but many different paths that can give the desired results. A tank that I adore might look barren to someone else, while a tank that looks like a frenetic disaster to me makes someone's heart sing. My maintenance routine is unlikely to work for everyone, as well.