I'm shocked to see that I'm probably going to be the most optimistic around here. I feel most people are still comparing her Dsmash to its Brawl incarnation and basing their scores off that.
OH. MY. GOSH. THIS SO MUCH. To everything Zelda does.
And yes, Dsmash has the tiniest bit more range than Dtilt in front at least, I have never tested the back, but since it has less range than the front iirc, than the back is probably shorter ranged than Dtilt. Its vertical range is definitelt better than Dtilt, and at the edges of the move, it should hit lower beneath ledges than Dtilt. So if you like, ledge-trump and then space yourself near the edge, you can do a Marth-style ledge hit with sweet-spotted Dsmash (Like his Fsmash trick.) and Dsmash KOs pretty well at ledges.
It was weird that it got and extra startup frame, making it 5. I'm only salty about that though because
someone else has a frame 4 Dsmash, which means we no longer have OR EVEN tie for the fastest Dsmash smh. It has one more frame of lag than before, so very negligible amounts. Though, both hits should not be safe on shield, especially the front one, which has like, 34 frames afterwards. While the average move has only 25 ish frames after. SO, super unsafe.
Also, for its speed, it does do good damage with enough range. If anything trading it in for a Dtilt once in a while will at least score you about as much damage as three Dtilts. For the same hit speed. I think the move is at least not truly a bad move, just overlooked for usage in light of similar options on other moves. Except no other move gets gimp angle on-stage? :D I suppose JigglyZelda said it right that there are like 3 recoveries unfit to make it after a Dsmash and only 3, lol.
I'll score it a 3/5 as well.