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Additionally, if you work with QML, the tool will search
for QML types and generate the .qmltypes file in case you want
to include qmllint into your workflow
This is from the email you sent out about the release. With Qt 5.15, C++ Qt added QML_ELEMENT, to simplify registration of classes with QML. It also was done to make it possible for static analysis tools to generate code completion models for QML without the need for the qmltypes file.
Python added @QML_ELEMENT with PySide6. Is it not possible to use that same construct for code completion with Python modules?
I guess the fact that it's not a compiled language, and classes can be altered at any time dynamically causes issues with that.