In the busy Hamlets it's not too bad since there are many people helping, I will even go out if I am bored. But I was at the wineport hamlet and I could see that as a problem because there is only like 4 or 5 people doing it, and 1 or 2 doing the run and killing the mobs. Alport, Owl's Nest, quarrymill and the golden bazaar have like 20-40 people there and 10-15 running the bomb, at least on Besaid.

But yeah seems like they would of had it where you had to at least emote the bomb once during it.