After reading Fegan's piece in September about continuity within the system and one voice/message throughout all levels, paired with the massive jump in analytics this year at the MLB level, I find the anger directed at Cooper by fans to be misguided.
When you read Eno Sarris talk about how the average pitching coach tenure is 1 season, you realize that continuity is likely a better driving force of success than constant turnover. You will have peaks and valleys within the tenure, but the continuity from level to level has a lot of value. Cooper also isn't as archaic as people think.
An excerpt from one of the articles I found promising:
But Giolito — who ditched his sinker and returned to working exclusively with a high-riding four-seamer because of a report from White Sox analytics in spring training — says that the simplicity of in-game cues frequently belies the complexity of mid-week work on spin axis, ride, spin rate, angle and extension. Getting López’s fastball to ride like it did over the barrels of Cleveland hitters all afternoon has been a back-and-forth battle with frequent hiccups. But it’s been about establishing in side sessions what elements in his delivery will produce the fastball action they’re looking for with Trackman and Rapsodo data, and getting him to carry that into games.
“A lot of credit to Coop and Has (bullpen coach Curt Hasler) with having the old-school background, old-school pitching mentality and learning all this stuff from our analytics department,” Giolito said. “Really, really educating themselves so they can in turn help all the pitchers. We look at that stuff on an almost daily basis in our bullpens and stuff like that and that’s been super beneficial to me this year. When I can look at an outing and see I climbed up a little higher (in release point) and my ride wasn’t as good. OK, let me go into my next bullpen and focus on getting back into my good (arm) slot and then we have the Rapsodo on it and it’s like oh, there it is, there’s the carry and the way the ball should be coming out. A lot of credit to them for learning all that stuff, taking it all on.”