I was thinking just the opposite, why have we been stocking up on prospects that are much more likely to be busts? Better to draft position players and then trade them in bunches for more established pitchers.
I'm trying to remember the exact quote/source, but the gist is the best pitching prospect is five pitching prospects
Signing veteran aces usually means overpaying for the downside of a career, I'd rather stock pile arms since some will pan out