Yeah, but in your general area, to be fair, there are very few wild trout streams to begin with.
One problem with hex's is that, like Drakes, the hatch period is so short. If you're not really trying to time it up, the chances of stumbling on a hatch aren't real good. And even if you are trying to time it, your chances are still only fair without some historical notes from which to base your efforts.
Imagine trying to hit Drakes without historical knowledge of dates for that particular stream, fly shop updates, or word of mouth.
Seriously, think about it. Drakes and hex's may only last 2-3 days in a given location. With Drakes, we know it's late May/early June, bout a 3 week window. We know it starts on the lower part of the stream and works upstream over time. We know which streams go first. And you constantly have someone in your ear saying "hit em at ____ last night", and a fly shop with a big banner that says "coffin flies are at _____."
So once you have a basis for that year, you can kinda predict. Ok, they're here tonight, they'll be here tomorrow, and then here the day after that, etc. And for the real hatch chaser, you can probably work out a solid week or two of chasing them throughout the state with pretty good success.
But what do you have with hex's to go off of? No fly shops mention em. Heck, in that area, there's only 1 decent fly shop that does update stuff like that, and it's on Oil Creek, which isn't known for hex's at all. There's no known history that this stream goes before this one. The wild trout streams in that area are too small to consider the going upstream factor. Each location simply has a 2 or 3 day window where it's happening. You can guestimate within a few weeks when that will happen, but hitting the right day isn't a simple matter.
Luckily, it's a good time to fish those streams even without the hex hatch. If they show up, great!!!!