I think Batdan was referring mostly to the godlike damage that any low level can do.
Putting a limit of, say, 5000 dmg done at level 500 would help to not have everyone who is fine with buying power be able to defeat the 2000 level + people by just maxing every legendary there is, because that is stupid. Ofcourse, people who dont buy legendaries, like me, still would not stand much of a chance :O