They did that so you could uncap them more easily.
Sure, until you scrape it all open and get honey all over and the robbing starts when you try to remove the adjacent frame... :-P
They do make some really neat thick frames. The problem is that they don't fit in cut comb boxes so you have to figure something else out of just extract.
They do it good sometimes. If you put an empty frame next to a drawn comb during a flow, they will fill and extend the comb as far as they can.
It takes a lot of trial and error to figure out how to do it better.