It all depends on what the goal of your creation is. If you're creating something to contribute to a community of artists who use one tool, I can see how it might be resented if your work features tools that not everyone has access to. The lines blur with Vue because importing foreign models is a big part of its functionality. I think just about everyone agrees that plopping stock models in front of a camera and rendering is scraping the bottom of the creative barrel. But I guess we should keep in mind that using other models isn't really true post-work. In my mind, post work is enhancing a render or compositing another image with a Vue image. If you're creating something for personal fulfillment, then by all means you should use whatever tools help you achieve that image you have in your head. Similarly, there's no room for purists if you're doing commercial work - then your goal is to product the highest quality image for a client using whatever tools are necessary.