The funky part being that the blocks aren't just syllables, the boundaries between blocks often correspond to the boundaries between morphemes, because of how the phonotactics of the language have evolved and Hangul was designed to fit them. To use English as an example, the word "cats" contains two morphemes, the stem "cat" and the plural suffix "s". In Korean+Hangul, this sort of combination tends to split neatly into blocks, and when there are multiple options for how the letters can be distributed over them, the orthography usually prefers the variant that keeps the morpheme spelled consistently everywhere. This gives the writing a neat sort of lego blocks feel.
There's plenty of other nifty traits to Hangul, such as the way many letters derive from each other graphically and thus lend themselves to two-step entry and reduced-number-of-keys inputs like keypads. And the design of the letters is featural, not arbitrary, that is they are often visualizations of tongue position or mouth shape when forming the respective sound.
The theme here is: There are many other concerns when it comes to the quality of a writing system. What the author is concerned with here isn't entirely unimportant, but a very, very narrow view.
This is partly because while Korean and Chinese are distinct languages, a large part of the Korean vocabulary consists of imported Chinese stems, and Chinese is heavily monosyllabic. As such, a lot of Hangul blocks are close homophones to the sound values of Han characters.
There's plenty of other nifty traits to Hangul, such as the way many letters derive from each other graphically and thus lend themselves to two-step entry and reduced-number-of-keys inputs like keypads. And the design of the letters is featural, not arbitrary, that is they are often visualizations of tongue position or mouth shape when forming the respective sound.
The theme here is: There are many other concerns when it comes to the quality of a writing system. What the author is concerned with here isn't entirely unimportant, but a very, very narrow view.