I don't think this is the case, it gets cc'd way longer. Running shine is probably always better
The thing with dash attack is that it is now easier to combo into extender moves like up-tilt, shine, and more dash-attacks at mid percents, and easier to combo into Bair and Fair as finishes at higher percents. "it gets cc'd way longer" isn't a big deal for 2 reasons:
1. this is PM where CC is really powerful anyway
2. dash-attack was never that good against grounded opponents in the first place, its best use is as an anti-air. It has a good disjoint letting you beat shffl options from your opponent like Falcons Nair. Also catching opponents coming down, it can trade even with falco's Dair and leave you in the better position.
Running shine is nowhere near as good for this as it hits very close to the ground.
Also I had no idea you could continue to true combo offstage with dair shine. Although cool, by how it sounds at least, I don't think this was as bad as you thought it was. Falco can still do this.
I play a lot of Falco and yes he can do this, however his shine-dair is way more risky than 3.5 wolf because how long the move stays out for, it also only works at smaller percent ranges than wolfs. I manage off-stage falco's shine-dair once in a while, but with wolf's I would do it almost every game.
One last point, I don't think anything about his wall jump was broken. I think it has hardly changed, but still I find it kind of random.
I loved his wall jump, it was one of my favourite recovery mix-ups combined with god like scar jumps, and it worked as a combo extender. I agree it wasn't broken, however that doesn't mean it wasn't more powerful than wolf deserved. Wolf's recovery is still great without it so I don't mind. I did experience some salt about wolfs off stage game and how fighting him feels like he has 3 jumps, so I can understand the nerf.