Gemini 11 didn't try to dock while spinning, manoeuvre while spinning, or keep solar panels aligned while spinning.
Which is completely irrelevant - because the problems spinning causes those things can be directly determined. There's nothing unknown. They're not theoretical in any sense of the word - they're very real.
You might want to review your definition of "theory". Hint: it is not an insult.
Hint: I am using the common definition of "theory". I have know idea what definition you're using, but it bears no relationship to reality. The things I discussed are actual effects, well known to anyone with the relevant background. They're in no way "theoretical".