Hey Andre
Questions aren’t a no no either. Controversial, I know, but let me explain.
Questions shouldn’t be banned because questions, like the one above, can bring more info than they require in the answer. “will you marry me” brings a lot of information; the asker is likely in love with their scene partner, they’re likely to be in a long term relationship, they’re probably somewhere romantic. That’s all good. The questions we should avoid are ones that bring nothing to the table “what are you holding?” “where are we going?” etc.
Questions are sited as being banned to discourage new improvisers from offloading responsibility of a scene on to their scene partners. Experienced improvisers should know how to use questions effectively.