I disagree. After Hughes and Kappo, there are a handful of centers/defensemen with better U18 seasons than Tkachuk (Byram, Cozens Dach, Zegras) , plus a bunch of guys from the USNDTP that were much better at the same age than Tkachuk (Boldy/Caufield).
You'd be hard pressed to walk out of the draft with a player worse than Tkachuk even in the 8-10 range. And even if you don't get the elite prospects, you still end up with a more talented player at a more impactful position. For example, I am sure you Habs fans are much happier with Kotk over Tkachuk.
Giving up this years pick for last year made no sense after they didn't win the lotteries.