As I said at the outset, this is not an area of scholarship for me. I have not published on the Senate. Indeed, I don't think you will find anything under my signature that would address the kinds of questions you're raising.
That being said, I'm quite familiar with the concerns you express, because those figure prominently in all of the scholarship that I was reading in preparation for my work as amicus curiae before the Supreme Court of Canada in the Senate reference. I'm quite familiar with those questions, indeed, although I have not published on them.