Sifsei:
You wrote: “But suddenly when it comes to Purim, after we made sure we heard every single word of the megillah, and we gave tzdakah to many many ani’yim, suddenly we can rely on the most meikil shita in achronim.”
That’s completely ridiculous, and I would hope you have the intellect to understand that. You have fabricated your own standard, and based on that, you are judging the Ramo, the Mishnah Berurah, and countless other poskim from many generations to be “meikil”? They are not addressing kulah or chumroh, just the etzem hadin. You are a mechutzaf for calling them meikil. You are free to engage in the dialogue about what the chiyuv of ad delo yoda is, and you can quote whomever you wish. These are not Shu”t that are engaging in pilpul to respond to a questioner. These are the poskim that lead Klal Yisroel explaining to us what the halacha entails. And when they tell us that it is preferred to sleep, that’s halacha, not kuloh. Yes, there were poskim who stated differently. This is a disagreement in halacha. Not kuloh or chumroh.