You can't argue with success. They drafted Purdy, even if it was the last pick. 31 other teams had the chance to draft him and they didn't.
They've hit on a lot of draft picks: Nick Bosa, Fred Warner, Deebo Samuel, and George Kittle, to name a few. They've also whiffed on some high draft picks. Their big trades for Trent Williams and Christian McCaffrey have worked out. At the time of those trades, not everyone was high on those two. I mean, they traded a 3rd and a 5th for the best left tackle in the NFL. And a 2nd, 3rd and 4th for CMC. Compare that to our big trades for Percy Harvin, Jimmy Graham, and Jamal Adams.
And Shanahan can flat out coach. He's not a huge motivator, but he's a great teacher of the game. And he has a lot cooking in that big brain of his. There will likely be more innovations to come. I keep waiting to see what his Kryptonite will be.