I think a lot of what you are saying is completely untrue. Laravel is a very capable framework for this kind of thing. PHP has come a long way since the days of PHP4, and Laravel/Symfony 2 are leading the way in that sense.
> Unfortunately there are still many frameworks used nowadays, that are missing very important things around groups, ACLs / RBAC and collaboration.
The framework doesn't give you everything, but there is a huge community out there for these kinds of things. For example, there is a package that plugs right into Laravel called Entrust: https://github.com/Zizaco/entrust.
> An experienced developer will of course identify these weak points of a framework immediately
What other weak points do you see in Laravel?
> Laravel is ok for a quick and dirty prototype that helps you to model your ideas, like a brainstorming session, but should not be used for a real project.
This seems like an extremely biased opinion again.
I am not trying to start a framework or language flamewar, but it just seems like you are more comfortable with Java or Python and as such you see those as being better. Objectively I think that is far from the truth.