OK, I'll list players. Matt Wallner, Trevor Larnach, Alex Kirilloff, Royce Lewis, Edouard Julien, Jose Miranda, Austin Martin, Ryan Jeffers, Nick Gordon. Even if only two or three of these players would have panned out, it would have been worth it. That's how it's ALWAYS been done, and the Twins wouldn't have been the Twins in the Gardenhire and Molitor eras without letting these guys suck for awhile.
It's not about stroking (sic stoking) fragile egos, it's about developing these players and part of that is letting them fail. And at the expense of winning? Winning what? They aren't winning a damn thing, so what would it have hurt to let Matt Wallner learn to hit left handed pitching LAST year? His splits are identical this year, so the numbers show it would have worked. Dear god, Julien made a terrible throw in the 9th inning of an 80 win season! So what, maybe if he wasn't given the cold shoulder by the manager, he'd still be hitting like he did two years ago. Is that pandering? Maybe, so what, this team needs cheap home grown talent, pander if that's what is needed! No doubt Julien is now cooked. Miranda too and maybe every single one of them. But this team did not have the overwhelming amount of prospect misses under the last two managers, who embraced instructing fundamentals and giving the young players the leashes to mess up. Not even close to this many misses.
I can't specifically nail down what the issue is, but with how many of these guys tore up AA ball and AAA but can't find consistent success at the MLB level, Occam's Razor says it's due to how they are managed at the MLB level. None of them can be counted on year to year, that's more than a coincidence.