It's the most important thing to all.
Baseball is never a sure bet, even with know players. Much of our expectations are built upon speculation and hopes, even for vets. Sure;y, they are easier to have faith in, but we've seen how almost a whole group of vets can decline or have up years, all at the same time, and make or break a season.
Prospects are much more speculative, but as a GM, you try your best to build up the farm. While many guesses go wrong, these ranking services to get more right than some random generator does, so they do pull some weight. There are examples of flops and surprises, everywhere.
I'm just saying, I'd prefer to look at our farm and see good things happening, and other people seeing the same thing I'm seeing, than having most of the experts saying our prospects do not look to promising. Of course, any of our kids can end up being let-downs, but I like our quality and quantity for the first time in a very long time. I know I can be disappointed, but I don't think I'm being optimistic for no reason.
I could be wrong, but I get the feeling you are choosing to be pessimistic with no real supporting evidence, except Law.