The term "Belichick 3-4" sounds like you are talking about the days of Seymour and Warren. The 3-4 that I've outlined here resembles the 4-3 he ran last year far more than it resembles any 3-4 he has run previously. The techniques are pretty much the same as last year. Most of the players are the same as last year. How would our LBs get smaller by running a 4-3? Are you complaining about BB's conception of a LB (or DT or DE), or do you not like something specific to the scheme?
Lots of folks are simply stumbling over labels, but you seem to be deliberately putting some sort of stock into the labels, and I don't understand what you mean. What do you view as the fundamental difference in the former hybrid 4-3 versus the current hybrid 3-4, and what is the problem with the latter? Or do you not like either?
I think BB divorced himself from the 3-4 / 4-3 labels long ago, as indicated by his response when switching to the 4-3 in 2010 and being asked whether he viewed Rob Ninkovich as more of a OLB or DE, and he replied with something along the lines of "I view him as an end-of-the-line player." By hydridizing and incorporating 1-gap principles into his 3-4, he addresses some of the need for as many larger 2-gapping 3-4 DEs (or 2-gapping DTs in a 4-3). The smaller DTs (the general term which I prefer for non end-of-the-line player), of which Easley is the best example, are better equipped to defend 1-gap than two, and are also more likely to be effective in the passing game. The hybridized 3-4 (and its 4-3 fraternal twin) in which Siliga and Wilfork (and rarely Chandler) are asked to 2-gap and everybody else 1-gaps is a compromise between the traditional BB 3-4 that is so deeply engrained in our collective consciousness and the traditional 1-gap 4-3 defense (or Bum Phillips 1-gap 3-4) - at least in terms of its run fits.
Do you not like these hybrid schemes? Do you not like 2-gapping (or 1-gapping) at all? Do you not like the way the hybrid 3-4/4-3 fit our personnel? (Personally, I wish Tommy Kelly were still around to add a big 1-gapping 3-tech DT.) These are all valid criticisms. Implying that a 3-4 is necessarily a traditional BB 3-4, because there are 3 DL with their hand in the dirt doesn't begin to address the nature, let alone the problems with the defense.