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There's potential of more diversity of genes in a sibling than a parent. We backcross to parents to strengthen the good qualities of that parent. Intentionally limiting the gene pool. With project birds the F1 generation mating onto selves is very common. What's not liked about it is that...

If they share bad traits then you'd compound them. If they have good qualities then you are compounding them. There is nothing wrong with close relation breeding as long as you are selecting for quality.