Using 3rd party content isn't really a viable option to a content artist because it requires all his/her customers to also have those 3rd party bits in order for the product to be completely useful, and yet would still lack support for the official parts those 3rd party parts are replacing. And there are too many different ones available to support them all. If I were just doing renders that would be different, I could use whatever parts I want or needed to use. But when I buy other artist's content, if the skin sets don't include textures for ALL of a figure's official/original parts, then I'm likely not going to buy the skin. I very rarely buy 3rd party content anyway since a lot of it doesn't fit my personal needs, tastes, standards of quailty, or some combination of the 3. So I only buy when it's something I need for a specific project and don't have time to create my own. Most of what I buy these days are just utilities to make my life as a content artist easier, or the base figures to build content for. 

When I bought M3 and his morphs, all his parts were included and I wasn't forced into buying anything I didn't need just to have access to what I did need. Same with David. Same with M4. So I don't get the sudden change with the Gen5+ figures. V3 and V4 never had those extra parts so it wasn't an issue.

 

~Shane