>You're not a member of a party, are you?
Yes, I am actually.
>Most MPs never see 80% of the comms coming from their constituents, their assistants deal with it.
Yes, and they provide a summary of issues to report and receive instruction on. I, for one, have sent and had adequate response from my MP('s office) on a number of matters.
>Even if all they do with this is figure out what the major topics are people/supporters/members are interested in asking that's better data than they have right now where the leadership just guesses based on what the leaders in The Sun and The Mail say.
That is not the only way that politicians are informed about the issues of the day or the feelings of their supporters, and for someone who thinks others are "fucked up" and "disgustingly cynical" for expressing well-founded scepticism, that is rather a cynical statement.
Petitions, twitter trends, top articles, comments, protests, party conference discussions and direct communications all make it onto politicians radars, they literally have staffers to make this so, and polling is one of the key activities of the main parties. Pretending Corbyn is somehow revolutionary for letting people send in questions is pretty far fetched.
Politicians have literally been writing books about direct democracy for years: and it's basically the cornerstone of the Green Party's constitution (for example).