I don't think anyone ever said having an Ace was sufficient to winning, it takes more than 1 player. Nor did anyone say it was a guarantee of post season success. I think, though I may be wrong, that people think it would help the odds.
I'd rather hope against all evidence the Twins can draft and develop great pitchers, but there seems to be decades of evidence they can't. Hope isn't really a very effective strategy. I don't know the best, most right, even better answer......but keeping doing what they did for the first 40 years of their existence wasn't working all that well. Maybe things changed for the better a few years ago, we'll find out over the next 4-5 or so.