Hello Magnus,
Actually, we don't update those themes for some time now, since the release of the OutSystems UI for the Reactive runtime.
So, not even fixes have been added to those themes in the past two years. The themes were only left there at the time, as removing them would cause a breaking-change for everyone using them.
Since then, all new applications should start with a dependency for OutSystems UI theme only, that works for web and mobile applications.
That being said, the move to the new patterns is by no means mandatory, and the deprecated ones will continue to work as before.
Best regards,
Bernardo