MotionVFX is full of it. I was a hard core Mac programmer for a number of years. Any time I needed to "update" any software, I basically started over "from" scratch. Why? Because I knew at those points how to avoid pitfalls that cropped up in the last iteration — and as time went on, I was a better programmer with better skills — if you're just fiddling with what you already wrote, you're leaving in a lot of baggage. Of course they're "rewriting it from scratch". It's still going to contain all the best they put in mO2 and hopefully some classy new additions. It's a bogus claim. End users don't care how the software is made. Everybody else would offer an upgrade path. Garner loyalty. If you want it bad enough, you'll pay any price for it. Me - I'm on a fixed income. I can't afford it anymore — but I also wouldn't afford it if I could.
Apple could have bought it from MotionVFX! They didn't... or haven't. [I know Szymon would have liked that.]
3D modelling is NOT as popular as you or I would like to believe. There really wasn't a whole lot Apple had to add to 3D Text to make it unbelievably easy to use and give the ability to create **amazing** models. Two reasons why they didn't: 1) It's not what Motion is made for, and 2) not enough people care. [At its height, I think there was about five of us: me, Karsten Schlüter, Pielle (fcp.co user name), Chris Talias, and Vladimir Roz...maybe a few more.]
Some of these are pretty good — considering they're 3D Text (and I would say better than a lot of USDZ models I've seen):
https://fcpxtemplates.com/portfolio-3d-gallery/
and if you take the time, these (short) video demos show most of them in "action":
https://fcpxtemplates.com/portfolio1/
[The roulette model - I can specify the winning number! Can you do the same in mO2?]
3D Movies were "invented" in 1922. Required Anaglyph glasses. Didn't really take. There was a resurgence in the 1950's — again — the glasses — again, didn't take. They made a big deal about 3D TV a few years back... where have they gone? I don't hold out much hope for VR either... same problem: gotta have the head-gear — and it's a lot more expensive than 3D anaglyph glasses. Until they can make holographic imaging look solid... they're just feeding fleeting "fads"... even Apple. I wouldn't be surprised if their VR set never makes it to market. If history is any guide, I don't foresee longevity for such products.