I won’t disagree with this, lol. Except that I have some doubts about log2(N) complexity being usable for crossover FB. Apparently you can compensate phase shifts when you sum bands which replaces quadratic growth of number of APF passes with linear (because you can compensate multiple bands in a single pass this way). I’m not sure if this can be done if filters are arranged in a tree, if not then it’s not worth the hassle. But this is getting a bit off topic.
So returning to non-crossover banks, MI Warps has one and it has some things relevant to this discussion: