Thanks, yes I realized my lack of suggestions for improvements after writing my comment. I simply didn't have any (it was also quite late), as I think there are some fundamental choices in that system that are not beneficial. My "low-level details" were meant as arguments against those fundamental choices, rather than nit-picks that could be easily solved.

In the end, I judged that (valid) criticism is better than no criticism, despite the negative feeling of being the guy that just "tears it down".