I read various articles about Mir and related topics on Wikipedia. The conclusion was that they had time to do far less experiments because of various problems.

I read various articles about Mir and related topics on Wikipedia. The conclusion was that they had time to do far less experiments because of various problems. Because of the issues, some modules that were constructed for Mir, later formed the basis of ISS initial modules. It's probably depends who writes such articles, someone born in the US, someone born in former Soviet Russia/CCCP or someone born in another country.