Great questions.
If I understand from this video and other threads that the view of this site is there is no method, nor one size fits all golf swing, that as shown in the various BM videos that there many fixes to the problems that ills golfers. I cannot disagree with this at all.
There are two different things you are talking about their, so I will explain why that is, and further explain their individual reasons for being.
There is no ONE method, no ONE pattern at the Brian Manzella Golf Academy. We believe that do to differences of all kinds, physicality, mental, athletic, etc, there is no ONE PATTERN that will make any decent size sample group of golfers as good overall—or individually—as CUSTOM DESIGNED, CUSTOM FIT patterns.
There are NUMEROUS reasons why this approach is THE BEST WAY.
1. Any reasonable study or research of the field of learning will show that individuality will always produce better results. It will also show that the more the lesson can be GUIDED and not OVER-COACHED the better the learning will be.
TrackMan is helping us reach closer to that GUIDED/Self-Discovery ideal every day.
2. Take the example of Shaquille O'Neal the poor free throw shooter. Mark Price, the vertically challenged guard who might have been 6-feet in shoes and extra socks, is the NBA's all-time leader in Free Throw percentage.
Let's also say that the experts considered his form to be near perfection.
There is NO WAY that teaching Shaq the exact, or near exact, angles of Price's forearms, elbows, knees, etc, will work as good for the big Aristotle.
Shaq's limbs are vastly different sizes than Price's, and the shot is a different shot altogether since Shaquille will be launching the ball from a height point to the same size goal.
Folly.
3. Once a custom pattern is chosen for a golfer, and taught ti the golfer, and learned PERFECTLY by the golfer, that golfer will NOT be able to make that precise pattern over the course of a career. Injuries, changes in physicality, etc. make constant adjustments and adaptations a necessity.
Gardening. Not building buildings.
4. No teacher on earth knows more than half of everything worth learning about the golf swing, and physics as applied to it.
Because the thinking man's teacher is always learning, the mechanical IDEALS will be in a constant state of upgrade and reverse engineering.
Not "reverse-reserve engineering."
Secondly, the videos are presenting actually stand-alone patterns. Not fixes.
The patterns are REAL as rain and can be found in use in professional golf right now.
The "fix" part comes from the fact that NO ONE ELSE has done a decent job presenting a SOLUTION to golfer's problems like SLICING and HOOKING.
The STRAIGHT-BASE LINE of the Manzella Matrix is simply a RANGE of possible patterns (not actual patterns) that could AND DO work.
Anything to far to the right is OUTSIDE of the MMBL (Manzella Matrix Base Line) because it is simply too far inside-out to produce good golf. The opposite is true to the left.
A random workable single pattern is only a "solution" for a SMALL PERCENTAGE of golfers mathematically.
The first time I go see or have a discussion with an instructor I would have serious reservations if one of the first things that they did not ask me is what are my short term and long term goals.
Some teachers do detailed interviews, some don't.
I ask many question during the lesson, and believe it or not, golfer's interview answers as a rule are almost always SUBJECT TO CHANGE.
To be honest, I NEVER give a Band-Aid lesson, I can fix people without Band-Aids. So by default, all of my lessons are developmental.
The Method teachers always have an out, don't they?
"You are just not doing everything I told you to do."