The QAB stat is one that breaks down the production of the hitter but does not reflect a batters production vs. a typical pitch, location etc to my knowledge. EX: has a hard-hit ball, sees 6 or more pitches, sees 3 pitches after 2 strikes,gets a 2-out RBI, executes a sacrifice bunt or sacrifice fly. (I am sure MLB has some sort of tracking though).
The game has changed a lot with technology. The type of data that can be collected today is unbelievable. Now the means in which that data is collected and used by coaches is another area that needs to be taken into consideration.
Most travel and High school teams lack the resources to collect and breakdown data to support some of the advanced stats. (Heck some scorekeepers are lucky to know how to score plays). Coaches and parents can misinterpret or misapply some of the data/stats as well or in some cases causing team,parent,coaching issues.
Another factor is consistency of competition and umpires. While we would all like to "cookie cutter consistency" we all have had games where umpires favor certain locations and I guess in a way that helps keep the strategy/approach of the game fresh.
So, for the youth or amature level of play don't get too wrapped up in stats. Sometimes this fascination with collecting data down to the pitch can be unfair to pitchers and batters especially those young ones that are still working to find their game.
I was lucky to have a solid group of coaches for years and a top notch score keeper for the last 4 years we were playing travel ball.
While we did not use any of these advanced stats if we wanted too we could break down a players OB%,BA,SLG% as well as our pitchers WHIP, ERA, PC by how well our stat man kept the book. This was old school with one of the Ultimate score books that allowed you plenty of area for notes on batters and pitchers.
I would think it is hard to find someone dedicated, fair and consistent enough to be 100% accurate in all of these new areas of statistics though.