Big deal. You have found a practice that is seldom followed and now you’re feeling your oats.
Question: When you are an invited guest while a זימון are present and you have been asked to lead the בּענטשן, do you do so over wine and then pass the בּעכער after the בּענטשן to the lady of the house? Rashi mentions this ancient custom in his commentary on ספר בראשית.
Do you make sure to remove the wine on the table if it is not used in the בּענטשן? Because that is a law – not a custom, a law.
This reminds me of a hothead pulpit rabbi who had found an obscure דין in the מגן אברהם that week and shouted on Friday night, “We are all מחלל שבת!” Terrific way to start people’s Shabbos, and also to fatuously proclaim his own ignorance and absence of human decency.
There are literally thousands of defunct practices, which some consider laws and others consider customs.