It’s understandable yes. In regards of fine tuning the filtering process, the provided example is pretty specific, what do you think is the right approach for a large scale filtering that a client should implement?
I don't know. Maybe over time people will settle on a certain set of common hashtags and then people can have following lists that include and exclude hashtags on a per-person basis. So instead of following a person, or following a hashtag, you can follow something like "mike & !politics". I think @hodlbod has done the most on custom feeds. I haven't looked deeply into what he did yet.