The 4 kosos are different than the wine drunk for add’loh yadah;
The 4 kosos are consumed around the seder table, at home, without exposing herself to the (ugly) events/non-tzniyus of the outer world.
Whereas on Purim drinking and going out can, Chas v’sholom, lead to issur.
So no comparison to 4 kosos should be made.
In my family we keep all 49 days
By counting with a ברכה !!!