Well I guess they just don't think it is necessary to have a n-ary tree. I use i3 but I rarely have more than 2 windows open per monitor (apart from my floating scratchpad terminal). Usually I have just two windows side by side per workspace. So if I would switch to bspwm I wouldn't really be limited by it. That is also my reason for not switching to a dynamic tiler: I never split my windows enough to where it matters.
You're spot on. Bspwm is just worse.
Dynamic tilers are always worse off in the actual window management department than manual tilers.
It's why it's best to use i3-likes and then add a script for autotiling, so you can always break it when you need (or make n-ary trees as you put it).
A window manager should be useful; dynamic tilers are not
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