While that may be true, it still stands that when Yoshi does shield that his options are not too great, and a character like Wario can take advantage of that. People may need to change their applications of his shield, but his shield is still somewhat bad when he does use it.
Waft says hello lol. That and Fsmash from Wario I think is stronger than Fsmash from Yoshi. For vertical kills Clap and Uair are about the same, and Clap is probably stronger than Yoshi's Usmash. That and Wario's kill moves are faster for the most part. What Yoshi does have are opportunities for guaranteed kill setups after a release, but you gotta get that grab first, and you better not be under a platform.
As for Dair, I would just SDI it fairly easily. Upwards Fsmash I think would hit, not sure what spacing issues there might be or not.
I think the biggest thing is to discuss how hard it really is to grab Wario and what are the safe %'s Yoshi can grab him at and not expect a ground break. For some stages though, I really do think Wario has it at even or better. But yes, moar discussing