Suki, you still cull weak/nonstandard birds when you landrace. You just don't line breed and let the birds select their mates instead of selecting birds based on compensating for faults. You definitely will get more variance from such breeding, BUT you also get birds that are vigorous and good layers, and some of those birds turn out great. As far as crossbeak goes, far more people get beak problems out of line bred birds than flocks with lots of genetic diversity. Same for many recessive genetic faults.