Feif un’s question is relevant and arises out of the fact that, in recent decades, we have conflated psak halacha and ‘milei d’almah”.
Clearly, when it comes to halachic issues, there is a well documented way of accepting the psak and , most of the time, “puk mo amo diber”, see whom the populace follows and indeed, R’moshe “psakkim” became the norm because the people accepted him as the possek of America.
The problem arises with “milei d’alma”-matters that are not ruled by halacha. On that, there is absolutely no compulsion to follow the “gedolim’ all the time.
You can certainly ask advice, you can obviously follow the opinion given but there is absolutely no “daas torah’ on that. This is a modern invention .