Your “valid” rejoinder means that there’s nobody more capable of making klal (or even prat) decisions more than you?
Why is that person “pseudo” Da’as Torah, vs. an expert on the subject matter?
???? ????? ?????? ????? doesn’t give capabilities to someone who doesn’t have them. If not, we would be discussing Nevuah, not Da’as Torah. All ???? ????? ?????? ????? means is that the Sanhedrin is law, no matter the qualifications, not that Yiftach, Rava, or Rabbi Amital is a Navi (or has Ruach HaKodesh, or Da’as Torah, or other capabilities) like Shmuel was.
However if a person asks if he should get a Chevy, Toyota or Honda as opposed to an Infiniti or Mercedes, that may very well fall under what is appropriate to ask of a Rov.
That is a Tznius and Tzedaka question, and appropriate even without the concept of Da’as Torah