I know one of the ongoing themes among opposing fans and the media is that the Leafs must upgrade their awful, awful defense---but I'm actually pretty happy with our group, thanks.
Rielly, Gardiner & Zaitsev are all legit top-3 defensemen, and Hainsey has been more solid and steady beside Rielly than I expected. I also like the three-man rotation we've got on our bottom pairing.
So yeah...don't really see the need to trade a 50-point center, 60-point winger, and take on a bunch of dead cap space when the team is in a position to win now. It doesn't fill a pressing need, and doesn't leave the Leafs improved at the end of the day.