Note that the patch left the damage mostly unchanged. It merely nerfed it vs shields (By half, which still drains the shit out of them), since shieldballs are weaker now, I wanted to lessen the hardcounter mechanics (and we'll probably further nerf gauss and flamer and nerf actual shieldgens themselves, but we'll have to see).
I like stiletto, it takes coordination between a land and air players to use right, affords a lot of control and really fills that planes-as-support function. However I am instinctively repulsed by the idea that it should be one of the best AoE anti-swarms and one of the best anti-heavies.
The problem with this proposal is that you're basically duplicating the Pheonix and Shadow but with EMP versions. We don't want EMP versions of every unit.
There are a lot of other things to consider though. We're currently looking at both Shadow and Pheonix bombers, Google has been proposing changes to them.
We're also looking at Gnat, having it be the anti-heavy option here sounds good but I can't see it really working the same way at it's role and weight class.
And we're still thinking about fighter diversity and how boring the plane vs plane matchup is. One proposal has been a fighter-bomber that you can field early in air vs air but also has some land harass power. I think a single target EMP bomb would be great, you could stun AA before sending in your bombers, you could do early harass by briefly turning off key structures. But it would need to be weak enough that you can't just permastun someones factory, and obviously something would need to be done about it being even worse a comsniper than the shadow, the gnat problem all over. I also don't know how I feel about your late-game anti-heavy force also having AA, but just having two kinds of conventional bombers and two kinds of emp bombers split along the same lines leaves a lot of problems unsolved in air factory.
Finally, I hatehatehatehatehatehate that all the anti-heavy units are EMP.