Duel Fianchetto

Pardon the Pun.

Perhaps this is so elementary that it will only require a simple answer, but something I don't believe I've really seen(or at least not often) in master games is dual Fianchettos,  whether they be on opposing sides of the board facing each other, or both on one side of the board.

Is this an accurate observation? Why/Why not?

This may be so the bishops are attacking the same side of the board.

I think it is because the side that is down a tempo (usually black) comes off much worse after the fianchetto, as often something is sort of pinned, or it is easy to attack. 

Although it is not common since most e4 games (sicilian, ruy, french, caro-kann) and a good share of d4 lines don't have this opening principles, there are still opening lines that do.

Fianchettoing is quite common in c4 lines, Queen's Indian defense, catalan, and many more that I'm not mentioning.

Take this game that just took place today:

I think it is because it is useful to have a Bishop defending the centre instead of sending them both to the edge.