The author's choice to refer to Black individuals as "blacks" (exactly like that, without even bothering to capitalize) twice in the book is interesting. Of course, it only happens twice, and a lot of text separates the two occurrences, so, fortunately, they were not distracting enough to compel me to put the book down. But while I gave the author the benefit of the doubt the first time, the second instance started feeling like a microaggression. It's dehumanizing and honestly borders on racism. I also sensed a very faint, perhaps restrained, hint of misoginy in the way Rosenfelder chose to exemplify his points at times - but again, nothing overt or substantial enough either to justify an outright accusation on my part or to make the reading experience unbearable. Just noticeable enough to be worth mentioning. Clearly he knows how to water down his wine.
Now, as someone who has recently grown an interest for language construction and in a natural - though unexpected - way, for linguistics, The Language Construction Kit is honestly a godsend. I can't think of a better way to put it.
It starts off accessible enough to not appear daunting but not so accessible that it turns out plain boring, and grows increasingly complex, increasingly fascinating. I picked up this book because I wanted to "construct" a language and didn't know where to start; eventually I was simply captivated by what I was reading. I didn't expect this kit to be so thorough. And though I'm not sure that was the main point (if at all), I am completely convinced me that "language construction" is not simply a "rigid" science as I feel the term construction evokes, but actually an incredibly impressive, frankly thankless activity for one to devote so much time, energy, intellectual capacity to - an art of its own, that is. It just isn't so much construction as it is an act of creation.
Though the literal first paragraph explains how this book "suggests further reading for those who want to know more, and shortcuts for those who want to know less," I strongly recommend sitting through the whole text if your only concern is the prospect of wasting your time.
Even the Kebreni chapter struck me as self-indulgent at first but I'm glad I sat through it anyway as, honestly, even if there were a bit of boasting in intent, I think there was also a genuine will to carry the book's rigor forward and provide the reader with a tangible, short and sweet broken-down illustration of his approach. I found it as pertinent and interesting to sit through as the rest of the material and ultimately think it was a good way of fastening his guide.