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In an ideal world, bug reports and support requests would be a separate stream from discussions and feature requests.  We work with the tools we have, while also working to improve them.  (A few people have reported software bugs on GitHub, which is fine too but not something we'd want to require.)

We've discussed a "discussion" post type, which would have different properties from Q&A.  It depends on threaded comments (planned, not yet implemented).

It absolutely does make sense to vote on site proposals and feature requests.  People who don't care one way or the other can ignore both, but people should be able to express "I think this is a bad idea".  In the case of your site proposal, you propose to combine math with one of the several sciences that uses math, and have received feedback from people challenging that grouping.  Some people clearly feel that your site proposal is confusing, arbitrary, or otherwise harmful, and have expressed that feeling through votes.  Another site proposal, Medical Science, has received downvotes apparently because people are concerned with possibly handing out medical advice on the Internet to unknown patients.  People should be able to downvote proposals they object to.  Ideally they leave feedback explaining what the issues are, as has happened in these cases.