It's also a shame the GAE team didn't pay any attention to any established frameworks that could have worked perfectly fine within GAE's constraints, like Pylon

It's also a shame the GAE team didn't pay any attention to any established frameworks that could have worked perfectly fine within GAE's constraints, like Pylons. Shortly after App Engine came out I put significant effort into making Pylons and related libraries work with GAE, but when there were problems on their end it felt like they reluctantly doing me a favor to respond to the bug reports and make changes. It felt like they had an anti-library mindset, even though there was no technical reason a lot of libraries wouldn't work well on App Engine.