I mean the secondary changed drastically because they decided to not pay their best CB, which is their right. They look to be a zone heavy team now, which is different. The smaller/quicker LBs is something they've integrated for years, they've played Chung and Dugger in the box often. Like you said BB said they "streamlined" the defense a couple years ago, theres a reason why the follow up question was asking if it was 2019, because thats when Flores left and their defensive coaching staff was thrown together. Kind of the same as it was now on Offense, which kind of fits my argument. Im not saying its the sole reason for standardizing the playbook, but I think that the coaching experience not playing a factor into the reasoning is naive
Also, I am not saying whatever theyre doing to the playbook is a bad thing. I was all for simplifying it while Brady was here as well, I think it played a reason as to why a lot of younger players never developed. Specific Guys worked here, which was great