I'm not trying to be harsh, but it seems like your main complaints are that (1) femdom-related advertising and content is not always tailored to your specific tastes, and (2) your Mistress is not a mind-reader and you are forced to actually communicate your interests, a process that involves slightly more words than you would like.

Something pro-dommes learn with experience is that certain interests often accompany each other, and that we can generally make a pretty good bet on additional activities a submissive might enjoy based on what he's already told us. If we didn't make this bet then every session would just be a laundry list of the exact activities mentioned in the email inquiry, with very little room for spontaneity or exploration. When we get this right, it's delightful. When we get it wrong, not so much -- which is why we ask for hard limits and communicate with submissives about their interests, in order to gather as much information as possible on what will and won't work.

Strap-on and humiliation often go together. You are aware of this. As an experienced submissive, you can now use your words and let the Mistress know you don't want the scene pushed in that direction.