This gives snother example where the old-generation Lego Technics bricks shine. Besides their circular holes at the side, these still connect at their top and their bottom side with regular Lego studs.

I wish these bricks have a comeback. Why did Lego go this way? I assume it was too complicated to use for some as it allows for a two dimensional connection. Although on the other hand, this actually increases creativity in my opinion, because you could do more with a small assortment of pieces. However, this of course hinders sales of new sets, which might be a reason why Lego had a crisis around y2k.