ayid:
Just curious. Did they institute the concept of making a kiddush in shul to celebrate the birth of a daughter? Celebrating an engagement with a “vort”? Chulent thursday nights? Late minyanim for shachris during bein hazmanim? These are all part of the Ashkenazic “mesorah”. I think what is most important is that someone who wants to make a “simchat bat” or whatever it is you want to call such a gathering, that it be done in a way that if they invite their Rav he would have no problems with any of the proceedings.
Making kiddush for the birth of a daughter in a Rabbinically sanctioned minhag.
Some form of vort was probably started by Rabbanim and it is only now that they’ve become ridiculously ostentatious that problems began.
Chulent Thursday nights can’t be called a minhag anymore then Thursday night pizza or Sunday night leftovers.
I think as long as one davens before the zman, there is no problem if you decide to daven later then yeshivah minyan during bein hazmanim.
I think you are (either purposely or not purposely) trying to conflate things minhagim with things that people do that might be wrong. Just because many many people talk during davening doesn’t mean that its the minhag to talk during davening. People do the wrong thing all the time. The question here is, what is the right thing.
I do agree with your last statement although I would add the caveat that the Rav be qualified for his position.