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I think it's because they've seen exactly where saying "yes" leads them and they don't like that place.

They hate fast code?

Perhaps the known opportunities for dramatic perf increases require compatibility breaks and some expressiveness downgrades.

That Python 3 transition was a fun time, yeah?

If python 3 transition did bring dramatic perf increases I guess people would have been way faster to sell that upgrade to their hierarchies. Not that I blame python team for the lack of it. But fictional dev history would have been different

No doubt, huge perf improvements for free would have made the transition more compelling.

However, what I'm suggesting is that large perf wins are not free. Breaking compatibility too much more could have doomed Python 3. And now that the devs know how painful a transition is, they're far less likely to break compatibility again for any reason.

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