It was said on twitter that the exp changes were to prevent poaching of lower level farm areas, but nobody did that to begin with. EXP already lowered the higher level you got, at the same time as exp requirement rising. It was a waste of time to try to farm lower level monsters.
There may have been many complaints about high levels killing all of the crabs, but this was because the spiders kept breaking, so that was the only place to farm. Furthermore, this doesn’t prevent the real reason players would kill things in lower level areas, which is to show off how strong they are.