The main idea of this article is to use what you already know and just get it done, rather than experimenting with new tools. The author already knew how to use most of these tools from a previous job. He stuck with the technology that he already knew, so that he could focus more on business aspects rather than new technology.
In that spirit, you should use the App Engine that you already know for as long as it seems to be working well for you. When you run into a problem that can't be solved in App Engine, that is the time to ask for advice on how to solve your problem.
In that spirit, you should use the App Engine that you already know for as long as it seems to be working well for you. When you run into a problem that can't be solved in App Engine, that is the time to ask for advice on how to solve your problem.