You have to think in terms of balance as well.
Most of the "big" guys Hextall has drafted the last two years are in the 6'0 to 6'2, 200 to 210 lb range, good size for a fast forechecking forward.
They needed a true PF, but one with skills (i.e. we won't mention names of some of the Homer draft picks).
Small isn't underrated, you just can't field a whole team of midgets, if you have Giroux and Konecny and AK, you want some full sized guys skating on the same line, whether it's to crash the net or make some idiot think twice about dirty play when he outweights our winger by 30 lbs. Same way you want to pair Ghost with someone like Morin or Provorov, big enough to discourage bullies.
The game may be cleaner, but there's still a lot of contact, dirty checking, stick work, and wrestling matches in the crease. The balance has moved toward speed, but size still has value (as long as the player isn't a stiff).