True, but if you want to have both full frame and apsc you only need to have 1 set of lenses that natively fits both of your cameras and in the last couple of y

True, but if you want to have both full frame and apsc you only need to have 1 set of lenses that natively fits both of your cameras and in the last couple of years Sigma and Tamron has put out so many budget lenses with pretty impressive performance of price is a concern.