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I thought the same exact thing. I feel like if anything, it obscures the implied relationship between B and C

I’d’ve gone the other way — the rounding makes clear that there is no direct link between b & c, where the orthogonal lines are suggestive of one.

The orthogonal straight line diagrams create a phantom b-c connection whenever you connect a-b and a-c.

Rounded diagrams can still have that b-c connection if it’s intended.