If a good Wario like DMG has ever been grabbed even once in his Brawl carrier of using Wario, it's a factor.
Saying otherwise would be as stupid as saying "Link's bad recovery is not a factor"
It is a factor, however a very minimal factor. You're making zero suit grabbing wario for an infinite seem like a necessary factor to bring up. It really isn't.
Look at the d3 vs wario matchup, where with d3's amazing grab range he can change and then grab-release to upsmash. This is a huge factor because most of d3's game is grabbing, so in this case it's OBVIOUSLY 70:30 for d3 right?
Wrong.
While it's a big factor in d3's metagame, and is what d3 is looking for. For most wario players, NOT getting grabbed is a factor in their metagame due to shenanigans such as grab release. And Wario can poke at d3 very well, so the matchup is closer to 55:45 when it all comes down to it.
Now, you're saying that zss, who generally isn't a grab heavy character, is going to do a good job against handling wario who is great in the air (definately beats zss in the air), with her grab which is no where as good as d3's and much more punishable?
Not at all..
Also, with the link's recovery as an example, Link players DI extremely well to make up for their horrible recovery, so that their recovery isn't as problematic as you would figure, however, it's still problematic.
Just as much as 'getting grabbed' is a factor, you have to look at 'how well the character can not get grabbed by the said opponent character' as another factor and compare them.
this is all my opinion obv.