Ultimately, corporations are in the business of making money. Canon's business decision has worked out for them, and for their customers. Nikon's business decision has led to a lot of forum postings questioning the compatibility of various gear. For my own part, I'm a bit wary of buying Nikon gear because I'm never sure what works with what, and in which modes, nor do I understand why or why not. So I stuck to AF-D lenses for my F4, and if I ever get that F6 I'm dreaming of I'll be limiting myself to G-series lenses.