A huge downside in edgeville PVP, in my opinion is, even edgeville is a multi-area, only thing that's different is the fact that you don't know when they'll rush you, cause in old-school runescape the delay from eating and auto-retaliate is HUGE, not like in the other versions, i don't know if OSRS has such a short time before you can be attack by someone else (if so they should fix it aswell lol)
just something id throw out there.
Short version; you can get rushed mid fight for just eating a shark.