The Mono team did not recreate what they had in Novell.
1. Mono in Novell put a lot of work on building Mono as a general platform. Xamarin is focused on where the money is: Mono for Android and iOS.
2. Mono in Novell was developed to form part of the SUSE Linux desktop. Xamarin does not do Linux, and in fact the devs themselves have apparently mostly personally switched to OS X.
3. Practically all Mono work at Novell was open source. Most of the work at Xamarin is closed source, the business model is to sell software for iOS and Android.
There's nothing wrong with either model, but just pointing out, they didn't just recreate the same thing outside of Novell. The two situations are hugely different, so it isn't surprising they are not that similar.
As for major new development, well, what is lost is a matter of opinion. Already with Qt5 the focus is no longer on native widgets (it's vaguely shocking how the project's path while at Nokia has got so distorted and diverged from the story that made Qt a success).