The Chazon Ish had many , many criticisms of Brisk. Here is one on the “Chakira” (also known as “Two Dinim”):
Why not three or four?
There’s a spectrum or continuum of possible “Dinim”. If the method was any sort of search for truth, two options would not suffice. But of course it’s all about shooting the breeze, sorry, I meant “increasing love and enjoyment for Torah”.