Yes, for a language as widely deployed and used as Python, retaining backwards compatibility and stability is more important than adding new and shiny tools to the stdlib at a faster pace. Users rely on the fact that a module in stdlib will remain there and will remain stable for a long time. More modules means more maintainers, and Python is an open-source project developed by volunteers. It's that simple.
I'm not sure what the solution this article proposes is. The tradeoff between "coolness" and "stability" is inherently difficult, and I'm sure Python is not the only language "suffering" from it.
After all, it's quite easy to install a new Python module, and not much harder to distribute it with your application (for web apps it's even easier), so what is the problem?