about the Chazon Ish, i don’t think the majority of frum american jews are obligated to follow his psak. of course he was one of the greatest talmidei chachomim of the 20th century, but so was R’ Moshe Feinstein who permitted using an electric shaver.
and how many of you guys hold that you need a mesorah to eat a land animal that has split feet and chews its cud? but the Chazon Ish said it!! nevertheless, in america we follow the american gedolim, and in e”y they follow the israeli gedolim unless there is some other reason.