It’s so clear yet we’ve had previous circuits before the 5th upholding the bump stock ban. You know why? Chevron. It absolutely needs to go first before SCOTUS rules on bump stocks, no matter how clear the statute might be. Otherwise, nothing stops the ATF from pulling the same thing again with literally anything else (pistol braces, FRTs, frames & receivers, etc).
You’re right. In general SCOTUS doesn’t like having to step in, they prefer to let the inferior courts do what they’re supposed to and only step in when absolutely necessary. Technically speaking though, these bump stock cases are not 2A cases. The whole point of these cases is that if bump stocks have to be banned then Congress needs to do it, not the ATF.
Mark Smith of the Four Boxes Diner actually made a video predicting this exact thing happening back when SCOTUS denied cert to their previous bump stock cases (GOA v. Garland & Aposhian v. Garland). He predicted that SCOTUS would rather not get rid of Chevron through a case involving a hot ticket item like guns, and that they’d rather do it through something that isn’t so controversial. IMO, LBE v. Raimondo is the case they’ll use to toss Chevron. After that, we’ll see what they do with bump stocks.