A double fianchetto isn't always bad, but in many positions I am not a supporter of it for the reasoning I describe here:
How can you punish a double fianchetto?
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there is no one panecea agaisnt this and in some openings like many lines of the english and the reti, it is the main line. It all depends on the position, if you mean specifically the hippo system, the common wisdom is to erect a 3 pawn center and wait for the right moment to close the position with the right pawn push(usually in reply to a wing pawn thrust e.g c5, you play d5). in some lines, early h pawn push hoping to soften the kingside and then use f4 to threaten it further if g4-g5 (or redirect your focus to the weak g pawn ).