I am in general agreement with many of the posts here, but I do suggest keeping in mind that offense has been down this year broadly across MLB. I think that may be skewing perceptions a bit.
For instance, Polanco and Jeffers have seemed to be struggling somewhat at the plate, but have wRC+ of 113 and 115, respectively. And in a tiny sample size, Celestino is basically performing at a star level by hitting a few singles and playing defense.
On the flip side, Joe Ryan has an xFIP- of 98 and Ober is at 118. The Twins' pitching WAR is 6th in the AL. So, while there are a lot of positives, there's still room to improve.
Having said that, the pitching pipeline is a big reason why I wasn't ready to give up on the F.O. What it boils down to is this: mid-market clubs have to be able to find pitchers in the middle rounds of the draft, and in trades, and by every other conceivable means.
It's not about any one pitcher - successful franchises like TB, CLE, STL, show the ability to do that well over a long period of time. There are signs of that in Minnesota, which is an extremely promising development.