Same reason MS used a Perforce fork instead of Source Safe. Because the dogfood tastes terrible. One of the executives at the late, great, Sun Microsystems onc

Same reason MS used a Perforce fork instead of Source Safe. Because the dogfood tastes terrible. One of the executives at the late, great, Sun Microsystems once dunked hard on Microsoft by saying, "At Sun we don't make dogfood. We prefer to refer to it as, 'flying our own airplanes.'"