We see this argument with every prospect. If a guy has success for any length of time the calls for promotions start up and escalate in a hurry, with assertions that the Twins are insane, evil, and/or incompetent for holding the player back. But at the same time if players were promoted on potential before demonstrating they were ready there would be an equally loud chorus of criticism for being too aggressive and demanding proof of performance before handing out promotions. Especially if that player bombed at the next level. You can't have it both ways.
It was totally reasonable that Berrios started in the minors after completely failing in his debut season and doing nothing in spring training or WBC to show that he had made improvements. Why throw him back out there to fail again? Once you've decided to send him down to get comfortable you aren't going to pull him back in a week or two, he's there for a reason and adjustments don't happen instantaneously. Maybe they waited 2-3 weeks longer than absolutely necessary, but they wanted to be 100% sure his next promotion was successful and hopefully his last ever. Seems reasonable and responsible to me. If he goes on to have a 10+ year great career is anyone going to notice or care they he spent a couple extra weeks in AAA getting himself right?
Do we still look back at Torii Hunter's career and have heartburn that he bounced up and down to start out? I sure hope not. In the end this was a tiny blip on the radar of what is supposed to be a rebuilding season.