The Python developers built the language they wanted to build. They were never obligated to do anything else. They are largely unpaid volunteers working on open-source software, and you're complaining that they're wasting... who's time are they wasting, again?
Here we go with this absurd argument again: "They're giving it away for free, so they can do whatever they want, and you can't complain." Sure, we're all free to develop software and dump it on the internet for everyone to use. Many people do, and most of it is useless and ignored. However people who want others to use their software, as I think the Python devs do, need to provide some value to their users. The value they get in return is less concrete, but it's there: reputation boosts, job opportunities, warm feelings from sharing, license to verbally abuse people on mailing lists.
Developers aren't obligated to please their users in exactly the same way that users aren't obligated to use their software. Just because there's no money, it doesn't mean there's no transaction, and popular free software is based on benefits to both parties.
If they want to help Python users, they should improve performance and add backward-compatible features. If they want to have fun experimenting with programming languages, they should change "Python's" syntax and semantics whenever they want. Either would be better than the current approach.
