Unfortunately this seems to be standard practice. Then you read "it's not practical business sense to ship out loads of service packs" well get it right first and you won't need thousand of updates rolling out surely?
I put a complaint in and requested a refund for V11 and 12. I was told "its been processed" I asked what that means, still waiting, it's been two years now.

I had good reason for it, just unusable software that crashed all the time, broken files, lacking support, I mean the amount of stuff I sent in they must have been sick of hearing from me, I suspect that's why they haven't responded to my request.

LOL. Hot Potato!!

I love Sharkcad, it often makes me smile.
The value for me is the ease of modelling in solids and then producing 2D sketches from that. It does this exceptionally well. Most CADs are the opposite workflow - producing 3D from sketches.

The main difference I have seen over the years is less crashing and watching the cursor spin.

I wont be upgrading for AI, but there are lots of other things that could be done for a V15 upgrade such as fixing the new but hopeless render engine, creating a proper timeline feature rather than the uselessness of modifying entities, a better workplane/face sketching facility, and I would like to see constraints able to be placed directly on 3D entities.

Given the software isn't a subscription and/or cloud model I think it's still great value.