Thank´s to Lemmy for the solution! Perfect fit for all Mac users that get so bored by this autoquit "function" - haha, indeed it is no function for me...
I just wanted to add a few comments why it is important to have the user quit the app and not the system.
In general it is a "how to use a computer efficient" problem.
First of all if you work a lot with your Mac you have a lot of apps for all different kind of tasks. Most of the people don´t want to have all of them inside the dock as the icons than get smaller and smaller.
Thinking about a few workflows or daily tasks to do you will find autoquit a no feature.
It is a Windows like behaviour. I have to work with Windows at the office and find this totally strange and stupid.
Although I have used Excel and Word during the day I have to reopen it to create new documents if I have closed the last window. The more apps you use the more complicated it gets. You have to search for the app to reopen it instead of just going to it by Cmd-Tab. With autoquit off work is much easier. Have TextEdit opened without a document and need a new one? Just click on it in the Dock - done. Or go to it with Apple-Tab and press Apple-n. Klicked on it by accident? No problem: Close the new window. No question like "Do you want to save?" because there is nothing to save. Compare it to the Office stuff from MS... It will ask you any time althought you haven´t done any changes to the document. Why ask when I only want to look up something in a Excel sheet or Word doc?
The best thing to sort out this would be, in my point of opinion, an additional switch in applications for the autoquit function. And - no surprise - only where it makes sense.
I.e. it is totally useless for things like Skype, FaceTime, Mail, any kind of Webbrowser and a bunch of other apps.
What is it good for?
SystemPrefs i.e.
Hopefully Apple will think about why people like Macs and how they use them. Increasing the market share is not only a matter of marketing. It has also to do with the quality of the system, the integration in existing environments and it´s easy use and support. Why buy a Mac when it is as stupid as a Windows PC?