I'm on Balmung and I do admit it is potentially an issue, but I don't see it being a serious problem. I've definitely seen examples where more than 3 people are hunting for the exact same mob at the exact same time. But I've yet to get angry over it, or see other people rage about it.

Some things to consider:

- You might think it to be bad manners but you can actually split credit on kills. Some people don't like you attacking their mobs, but if SE really didn't want that, they would have implemented the claiming system from FFXI. You do not need to be partied to split credit.
- Certain FATEs can spawn tons of the specific monster you need and they give you credit just the same (often at a lower level and easier to kill as well).
- The Heavensward maps are big(ger than ARR maps). "Spawn camps" are larger than you might imagine. Spread out and look around, it is called "the Hunt" for a reason after all! Some monsters even have multiple spawn camp locations. There are some maps floating around the internet about Hunt locations but they are not 100% accurate, so open your eyes and actually take a look around you. Shouldn't be that hard now that you can fly.