Sure, some people use classes when all they need is a namespace - and for that having a file is enough.

If there is a collection of related data, it is (often) good to have it as a class. In the config example, a class may work better - as then you can pass it as an argument somewhere.

At the same time, in many cases, instead of a dataclass, it is worth considering Pydantic (https://docs.pydantic.dev/latest/concepts/dataclasses/). It can deal with validation when data comes from external sources.