It is very interesting, well worth reading Heiko Bleher's comments as he really has travelled the world, discovering new fish and studying their actual biotopes.
Many of these set ups really do look natural, i.e. resembling what you might see if you could look underwater in a stream or pool. This is in contrast to the aquascaped tanks which may look attractive, with their carefully trimmed and colour-coordinated plantings, but are in no way "natural" looking.
Getting a true biotope arrangement is really tricky, finding the correct plants and fish from a precise area isn't easy. Whether it's worthwhile for most people is a different question. I prefer to have my tanks looking natural, not "designed", but non-specific.