I understand the thought process but you’re neglecting the fact that the trade proposal is for a proven commodity vs “could be as good as…”.Acquiring a RD in his prime is one of the most coveted positions in sports and costs a lot in assets. It's cheaper to use a first on a player in the draft, than it is to trade or sign for one.
Would you rather have drafted a prime Tanev and had him on cheap deals or spend multiple picks and prospects acquiring him from another team or throw the bag at them in FA after he's past his prime?
Regardless, I very much like this pick. I hope he gets 2-4 years of development; let him over-bake a bit and rather rewards later.