Title says it. After several unsuccessful tries I got my first BGH kill only to find myself locked out of that creature (lowest Rex) for an hour. This seems rather unnecessary, as the exp drop was only like 12k (with bonus xp).
They hyped this update as basically “boss fights for skillers,” but combat bosses can be farmed without any restrictions, they even allow instances to force faster spawns and give better xp and gp. The first time going through BGH getting the kill was frustrating,, but I was looking forward to trying again right away to work on improving my “kill time.” I don’t see any reason to delay when you can kill again, other than as a consequence for failing (liking dying in PVM) but honesty I think I would prefer if the consequence of failure was getting killed rather than getting locked out of the content for an hour.