I would probably guess that this is because it is easier to develop for a nebulous piece of vaporware than an actual product platform. If you are developing fo

I would probably guess that this is because it is easier to develop for a nebulous piece of vaporware than an actual product platform. If you are developing for the latter then eventually people expect your code to work and ship, while for the former allows you to write endless blog posts about how your port of the Duke Nukem Forever engine is going to look...