We'll concede in most games regardless of formation. I've even discussed this with you in previous posts so pressing this point to me is purposeless. The formation isn't the common denominator to our defensive issues, the quality and ability of our back line is.
But in the same breath, this issue is also why I believe that usual formation will exacerbate mistakes against better opposition or high press teams. As giving our CB's license to have more time on the ball is borderline suicide - something I believe our usual formation does. Hence why I have consistently reiterated in recent weeks that Robins needs to be more flexible in his formation choice and utilise the 3-5-2/3-5-1-1 against teams who are either of little threat going forward, use the high press or don't play in a similar style to Birmingham/Cardiff/Norwich, and in turn utilise the formation we now use against teams who's style is essentially opposite of the aforementioned styles or at the very least less threatening.
I think the key to surviving in the Championship is to be adaptable. Unfortunately Robins has a propensity to be entrenched in his views and rarely likes to adapt to the opposition and instead will stick to one system unless something forces his hand. He needs to become more self-aware/tactically astute this season if we're going to turn losses/draws into wins and in turn, stay up. Personally, I thought this was the ideal game to utilise the usual formation as despite Derby's propensity to concentrate their attack on the wings I thought they posed little threat in the box.
Like I said even if we conceded using our usual formation, the freedom it gives our players to attack means that I have confidence in the fact that we would've probably outscored them for reasons I've already stated in my previous post.