Wow! We are some holy bunch; much frumer than our g’dolim and ancestors ever were.
Ever hear of the yiddish expression, “firen tzim chippa”? It means to walk your children down to the chuppa. And they went with an entourage. Ever hear of the “kallah na’ah vlchasusa”, it’s what you sing when you see the kallah and observe and proclaim her beauty. You want “Rabbanim should gather together and refuse to attend such weddings”, well what do you think the Rabbi’s wives and daughters wore at their weddings?
Just about all universal Jewish and even non-Jewish wedding customs can be found in the g’mara. It was even customary to make weddings on erev Shabbos and have non-Jews play music at the seuda which took place ON SHABBOS.
So stop all your whining and try to work on your own midos before yapping off on time treasured customs.