The forum is mainly user to user so the chances of getting an answer to either of those questions is probably unlikely, you would really need to email Vectric support & ask them for their reasons. Michael has already explained this but I purchased Vcarve pro at V7 & there was no 3D toolpathing at all & no 3D clipart.
I don't know the details but Vectric worked with a Company called VectorArt3D, I believe Design & Make has now either taken them over of bought them. If you purchased a 3D model fromVectorArt3D they had a free program called 3D machinist that you could use to toolpath the models that you had purchased, you could then import these toolpaths into Vcarve for cutting as part of a project, you could only import the toolpaths, you couldn't make any sort of changes to them. I don't know if there was a limit to how many toolpaths you could import or not. While it did work it was not a great way to do things from my own experiences.
There were some major changes with V8 a lot of new features including the ability to toolpath 3D components & folders full of 3D models that you could use. Think it was V8 that they introduced the desktop version as well. Prior to this you bought either Cut2D or cut3D, VCarve pro or Aspire. Vcarve pro stayed about the same price it had previously been & Vcarve desktop was introduced at a lower price making it even more attractive to those who owned small desktop machines.
I actually started with Cut2D as I already had expensive signmaking software that was great for producing vector artwork & having used it for years was quite proficient with it. I soon realised that there were other things that I wanted to be able to do that Cut2D wouldn't do so upgraded to Vcarve pro. I don't believe that there is a one size fits all software & every program I have has limitations, things it is good at & things that it is not so good at. My signmaking software does photo editing but not as well as Photoshop so I use photoshop, photoshop doesn't enlarge prints to the size I need very well so I use a specialist progrm for that.
I think Vectric are quite clear on what each of their software programs will do & if when I was looking at cad/cam software it hadn't done what I wanted then I would have looked at other software. They have to draw a line somewhere between the different programs they sell. Sure there will be other users who think it should do certain things with other parts of the program. Aspire is more expensive but it does a lot more, every user will have a different opinion on what is & what isn't worth the additional cost. I know people who spend a lot more than the cost of the software on their particular Hobby, maybe it's not all in one go so it doesn't seem like they are spending that much. I know I use to spend a lot of money on Fishing when I was able to take part !!!
I am looking to run a Business so things are a little different for me, do you sell anything? That would be one way to save for a more expensive program that may also help you to sell even more