Edit: @lwien where did you find that?!? I want to put a water tool or hydratube on top of that!
Thanks for the link. Well I liked it until I saw the price tag!
I think boro generally comes in tubes, so naturally water pipes are round
One reason would be that glassblowers get their glass in round tubes or rods,Its all in the tittle...
I do get it I think, much easier to work on a round turning unit, but is this the only case?