Conflating key/value lookups (dicts) with structured data (classes). They are both useful tools, but are for different purposes. Many python programmers (Myself many years ago included!) misused dicts when they should have been using dataclasses.
There's actually a place where the original authors subclassed dict, and dynamically generate attributes of a "data class" such that it can be used with dotted attribute access syntax or dict access syntax but the `__slots__` attribute of these classes is also generated dynamically so you don't have any auto-complete when trying the dotted attribute access. It's genuinely insane lol.
Under the hood, classes are also dict lookups, so really, this is mostly about adding type checking (unless you are also using slots).