The stall then fall Dairs suck even on the top tiers, although Sonic's is usable because it can autocancel or be used reasonably offstage with the help of a spring. I mean, most swordsmens' Dairs suck anyway.
Marth, Lucina, Ike, Cloud, and the Pits have largely the same amount of range on their moves. Marth only had a noticeable range nerf on two moves from Brawl, too. Also have my doubts on the theorized speed of his attacks... Trailers always lie.
Well, I'm seeing similarities to Zelda. Dragon's Breath is undeniably slow, but looks powerful. I don't think it'll be useful in neutral whatsoever, even with the paralysis. Either way it looks like you'd have to be dumb to get hit by it. Dragon Lunge (wasn't it Dragon Lance?) is essentially a tether grab and looks laggy if it hits the ground. I don't see it having particularly fast startup and beating shields, so either one or the other. I'd bet the later but there's no telling either way. Fsmash looks powerful for reasons you guys presumably already know, but that's kinda a problem... (Also doubt the charging hitbox properly links into the main attack but that's not my point.)
These are all very powerful and fairly safe FFA tools. Zelda has Din's Fire, Phantom Slash, and Faeroa's Wind. (...However you spell it.) All of which are, again, powerful and fairly safe FFA tools. Zelda's gameplan is to keep at a distance and keep throwing these moves out, so to balance this they make it so she can't fight in close quarters worth a damn. Corrin looks to be going down this road. I mean, Zelda's bottom tier and hasn't had any meaningful changes in patches. With Corrin they basically only have one shot, regardless of if there'll be another patch after he comes out since I doubt the final patch will have any big changes.