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When does LEGO use hollow studs vs solid studs, and why?
So I was looking at some parts on my desk here at work, namely the Boost Move Hub, and the WeDo 2.0 Hub, and I noticed that both of them have some solid studs, and some hollow studs. See this picture.
How does LEGO decide when to use hollow studs vs solid studs? I perhaps understand different parts having different types of studs, as they'd maybe be designed at different times and by different people. But the hub itself has both types of studs on it - the same part.
Is there a technical reason for when LEGO decides to use a certain type of stud?