I had an older relative a”h who was zoche to attend a Nevorodok yeshiva in Europe. He told me the hanhala there Assered drinking on Purim because it lead to “znus”. Did they not know the laws, or are the situations that override the laws?
Someone else told me they didn’t drink in Europe because they couldn’t afford it.
It’s a yom mishta vsimcha. A mishta is wine feast. That’s just what it is. A yom mishta is a day of wine feasting. I think it’s pretty clear what the objective is.