> This post is surprisingly confused, it is phrased as a complaint about the language, then immediately degrades into CPython implementation-specifics that have little bearing on the actual usability of the language itself.

You might think that, but you are very wrong and I should probably make that point in another blog post. These CPython specifics are enshrined in the language. While PyPy does not have the actual structs, it needs to implement the same user exposed API as it slots were used.

PyPy cannot just say "a + b" means "a.__add__(b)", it needs to implement the exact same dispatch logic that CPython has because people's code depends on it.

//EDIT:

> Ronacher seems to be advocating that we should punish the CPython implementation's traditional strong areas in favour of.. actually, he didn't even describe any vision that was impacted by his complaints.

Maybe I did not make my point very clear but the whole last paragraph advocates about trying a version of Python that abolishes the internal slot system.