You can haul firewood in a Corvette. But you're going to have to do a LOT more driving to get a cord home than you would if you used a pick up truck.
They call them belly guns for a reason. They work fine at belly to belly distances. The coarse sights, and less than precision trigger pulls (stock guns), and even (to a degree) the short sight radius work against easy long range precision shooting.
Can I hit a "regular" target at 100yds with a snub gun? Absolutely, once I have practiced enough to learn it. Single action, off hand, with a little bit of a learning curve I'll ring the 200yd gong on the rifle range. Been doing it for decades with all kinds of guns. Not nearly as difficult as many make it out to be.
That being said, combat shooting at that range with any pistol, let alone a snub nose is a) ridiculous, and b) next to impossible, even for experienced long range pistol shooters.
I am confident that if I had to, shooting a snub nose, DA, with the briefest time to aim, I could hit within a few yards (hopefully a few feet) at 100yds.
Aimed slow fire? They'd surely know they were being shot at, and if they stayed still, at 100yds, I'd get a hit before my gun was empty (providing, of course, I could spot the fall of shot...
Realistically, as a simple private citizen, I can' think of a single plausible situation were justifying defensive shooting at that distance would be easy, or even credible. But then, my imagination seems to be getting more limited, the older I get....