I love all the new marksman items and reworks of the old ones, but..

I very highly question the nerfing of many of the existing items for other classes. cost going up by 500. Why? losing 20 AP and 5 armor. Why? cost increase by 250 why? on hot damage reduced to 6% health why? is losing 15% AS, 15AD, 30AP, and 3% MS why?