I agree that skepticism is important, but this is honestly really straightforward if you've been following the development and community discussion. IMO the Angular team made it rather clear why they were skipping the 3rd increment (router package was on 3 and they wanted all of the packages to be at the same increment) and that upgrading version numbers was just semantic versioning and not releasing of a new framework like Angular 1 to 2 was. There were also a few popular articles explaining that no one should be freaking out over the 2 to 4 change and a lot of discussion on HN.

So at this point, a few months into Angular 4, it's simply wrong to make the comment that the OP made.