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Probably because a suit which is likely to play for six tricks opposite Qx
if partner got Qx hes going to be very agressive to make a courtesy raise so you shouldnt missed many games anyway.
I would be afrid partner got
Axxxx
xx
Jxxx
Qx
but anything more than this and partner will bid 3C. IMO the range of hand where 3C is terrible is a lot higher than the hand you re going to miss game if you only bid 2C.