Which Bitcoin developers are referred to as saying that "users have no say in the system's core development" Genjix wrote about this in two recent posts. Here's one.


  Some developers argue that with the issues being highly complex, that
  users have no say in the system’s core development


And the other:


  Other developers disagree with giving this information away and feel
  like you as users should trust their judgement


Are there public expressions of some core developers that object to public scrutiny and participation in the decision-making process? Who, of the core team, has issued such opinions?
You misunderstand what the developers are saying. They are not saying that they object to pubic scrutiny and participation. They are saying that being a user of Bitcoin does not somehow specially qualify you to comment on the design or implementation of the Bitcoin system.