You’re conflating the argument that the difference between managers and hitting coaches is minimal and the argument that the position of managers or hitting coaches or whatever doesn’t matter. They aren’t the same thing.

1-Few, if any, managers or coaches have a discernible impact on teams when compared to their peers. For the most part, they are all “baseball men” who’s ultimate impact on players’ performances is probably close to negligible in relation to each other. For an example of this, look at, umm, every manager ever. They are all good when they have players having good seasons, bad when the opposite happens. This is even moreso true of hitting and pitching coaches. The exceptions are few and far between.

therefore

2-It doesn’t really matter who is employed as manager/coach as long it’s not a total moron. If it was someoe innovative or whatever that might be cool but other than that, meh.

You’re acting like I meant “change for change’s sake” while the team is 10 games over. The implication in my statement is that you make a change based on poor results, even if you can’t directly link them to “Wedge uses his relievers as outfielders” or “Shelton tells them to not swing in 3-2 counts.” The results suck, even though I suspect the process looks almost indistinguishable from that of every other major league hitting coach and manager.

So, when I say change for change’s sake, I mean only that there’s some anecdotal argument for clearing the air and making the players and fans feel like a “change is being made.” Even if you can’t really explain why Wedge and Shelton are being fired (which no one possibly can-this is the players’ faults ultimately; no one overhauled all their approaches or misdeployed them) it’s ok to fire them, essentially for the heck of it.

Billy Beane pretty famously did this with Art Howe. Howe was fired because he didn’t win in the playoffs, which Beane has outspokenly said isn’t really anybody’s fault-that it’s a crapshoot. Still, Beane decided to do it, despite the fact that Howe was coming off three seasons 296 games (!) the previous three seasons. Beane’s implication, at least to me, is that it doesn’t really matter who’s doing this job as long as they don’t do anything moronic.

To me, the hitting coach is pretty similar to the athletic trainer, just with a lot more pub. All the candidates at the major league level are qualified and they all look the same on paper. You might find a great one occasionally but more than likely they’re all going to do the same thing-whether that’s suggesting rest and ice or telling a guy to quit dropping his hands.