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A couple of points--excuse me if they are obvious. First, there is the advantage of the bishop pair and then there is the lesser goal of not allowing your opponent the advantage of the bishop pair. The phrase "repertoire for the bishop pair" seems to me to imply the former. Second, if there is distance between a knight and a bishop, the bishop can exchange itself for the knight, but the knight cannot exchange itself for the bishop; and the bishop can run away out of range more easily than can a knight. So unless someone allows his bishop to get trapped, you choose to give up the advantage of the bishop pair, but your opponent chooses when you will acquire it--when he gives his own bishop pair up in order to smash up your pawns, etc. Since White is in the driver's seat in the opening, he won't do that without exacting a heavy price. Third, to use the bishop pair you need to open up the position. Openings described as solid generally have positions that aren't very open, which in turn means the bishop pair can't shine: if that happens in the early middlegame or the opening, you simply don't have a "solid" opening in the usual sense. (The IQP positions of the French are solid, but not in the sense most people want when they speak of solid openings.) Concretely, Avrukh's White repertoire 1.d4 is largely based on keeping the bishop pair, but the positions can get quite sharp. As for Black, there is, for example, Bareev's line in the French defense Burn variation, where he retreats the bishop back to e7, saving the bishop pair for later use. But, as in the Sicilian, Black then has to endure an attack!
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