I can see that as a reasonable concern. Two points though: 1. Speaking personally as a user, I wouldn't mind this a bit. And would actually love the ability

I can see that as a reasonable concern. Two points though: 1. Speaking personally as a user, I wouldn't mind this a bit. And would actually love the ability to provide feedback more readily. I often hate the content of my feed and I would feel much better if it seemed like I had greater input on its filtering. 2. Whether gathering feedback has a negative effect or not seems like a testable hypothesis and this could be tried and measured, rather than simply speculated about. Given the above, I'm not sure if this would be a rigorous rationale for avoiding the active feedback experiment.