I'm essentially neutral on the question of technology. To me there's more than one way to do things and very few primary cosmic truths in fishkeeping: keep your water clean, don't overfeed, educate yourself and use common sense about such basics as fish size, tank size, temperature range, etc. And, whether you're a geographical purist or not a geographical purist, know enough to keep compatible fish together-- in other words don't be pretend you're being clever by "thinking out of the box" and keeping some idiotic combination of fish: "I've had 2 inch Tropheus, discus, and clown loaches together for 3 days and it's going great!" After that are some secondary truths about nutrition, the fish themselves, their habitat, and other finer points you can learn as you go.
I don't really agree that the concept of a fish community is a conceit, though "community" could convey a misconception to some. But there's plenty of literature about species commonly associated with each other, you can watch all sorts of wild videos showing species mixing together in a single location, like in a branch tangle, behind a fallen branch, etc., as well as watching certain species commonly move and travel together, like Mesonauta and angels. On Youtube are Project Piaba, Biotopia, Below Water and others that have shown this, as well as some quality Facebook pages, like Planta Aquaticas do Brasil.
Watch enough wild video and another thing you learn is the number of species that are found in varied habitat, which don't follow some of the stereotypes people have: like angels, or severums, or discus, or whatever can't handle current. Or 'you can't keep geos and angels together because all geos live in fast current (certain species do, not all) and angels can't handle current.' True, you don't find angels (or discus or Heros or Uaru) in the rapids and, no, you don't want their tank to be a whirlpool, but that doesn't mean they're can't handle current.