Thank you for your feedback.
The functionality and the framework in Sitefinity 4.x is somewhat more complicated, but this comes with advantages beyond just embedding functionality in the UI. Just an example - this architecture allows us to create a content type builder module much faster than we were able to do it 3.x. In 3.x you had to code even your web services if you wanted to have 3rd party apps or web sites to connect to your web site.
I agree though that making the system harder for users is not good. The issue is not that the system is complex, but in the quality of the documentation. We are hardly working on this - we will provide more samples by the end of this quarter and have extra resources working on the developers guide. Moreover, we are going to provide step by step documentation for an upcoming feature that we are currently building - every step we took with this feature will be put in the docs.
I suggest you contacting our Sales Representatives, they might be able to provide you with a 3.x license, depending on your requirements.
I agree :) Let me say it again - we are working hard on the things put on the list :).
@Patrick - I'll check what can be done on your request.