At that point the UAW rep is “allowed” to hear the concerns.
Many other things happen that can kill even the most basic common sense request.
Eventually, when it is time to vote on the contract, the UAW rolls the negotiations up into multiple campuses (at least with UC), so it is mathematically impossible for a given campus to block a contract ratification.
This is exactly what happened with UC Santa Cruz in 2020, and the reason UC Berkeley’s health care plan no longer covers a bunch of women’s health issues. (Word has it the union rep suggested that cut, not the administration.)
See my other comments on this thread for links, etc.