"What's you're endgame" is the Washington regulatory equivalent of "what's your greatest weakness" or "what salary are you looking for?" It is an invitation to negotiate against yourself. At the same time, failure to have an answer gives the relevant decisionmaker an excuse to do nothing. After all, if you don't have an ask, there is nothing to do.
I find "we want to make sure the process works for everyone and that consumers are adequately protected" is the functional equivalent of "sometimes I work too hard/a salary commensurate with my experience."