but we have to keep in mind - eilu veilu divrei elokim chaim.
This is just wrong
I've personally heard a number of poskim point to the V4A as (part of) the reason we are mechuyav to buy only with a hechsher.
True, I didn't put a spit through them and roast them on a slow fire until they revealed exactly which lomdus they were using to say that. Whether it was the original takana, or a hanhaga that KY took on itself, or minhag avoseinu, or makam shenahagu, or any other one of a number of mehalchim.
The fact is that there are poskim who see the takanos of the V4A as a contributing factor in the halachic process.
You don't have to like it. You don't have to accept it. You do have to have respect for them.
I don't know who you are in real life. You may have a respected rabbinic position, or you may be a very learned Baal Habos. I don't really care, bec on the forum you are just an anonymous member of klal yisroel, and need to act with respect towards rabbanim and poskim.
(BTW If you have a problem with Rabbi Blier's positions or choice of wording, his email address is not a secret - why don't you email him and ask him? That way we all can learn)