notpashut: Sometimes, you’re not “relying on the maikel”. For example, R’ Moshe zt”l paskened that you don’t need ch9olov yisrael in the US. Would you consider R’ Moshe a maikel? Yet, many people take the chumrah on themselves. There are many other chumros like this. I’ve asked Rabbonim about certain things, wanting to know the mekor for things I was told were halachos. I was told they are chumros which are widely accepted. Maybe they’re accepted in Brooklyn and Lakewood, but where I live now, I don’t think anyone accepted them. In Europe, I don’t know if they were widely accepted.
When a “yeshivish” crowd accepts a chumrah as a whole, it doesn’t become halachah.