You may not, but that doesn't change the fact that it is an extremely well known meme that internet culture in general understands and uses. Frank is speaking not just for himself, but for the broader internet meme culture. It's like the

series.

I'm sure you could find images of people, even famous people, being more expressive and emotive with the "you mean... ...right? ...right??" sentiment. But nearly everyone already knows this one. It's just an internet thing at this point. Same with the Jesse-Wtf emoji. That's what Frank means by shared cultural reference (I'm pretty sure anyway, I'm not trying to put words in anyone's mouth).

Also, the is imo a rather perfect expression for the way it usually gets used.

We do already have other "wtf?" emojis like that express a similar but slightly different sentiment (though they also lack that cultural touchstone).

The image of Walt seems very expressive to me, but it's not the same kind of "wtf" as your Jackie Chan emoji. The Walt one expresses more of a dumbfoundedness, a kind of mild shock along with confusion and importantly, a bit of disdain. There are a lot of circumstances when that kind of specific sentiment is what's called for. That's not to say your Jackie Chan one wouldn't also have moments where it would be more fitting and the better choice, but it's showing a very different kind of emotion, one that I would expect would find moments of appropriate use fewer and farther between. In short, the JC emoji would be for different circumstances, with more over the top exasperation, and wouldn't fit well in some places where the Walt emoji does. So I would say sure, add it to the bunch, it is just definitely not a replacement of the perennial emoji that is Walt's "Jess, wtf?!"