Depends. On one hand I get what op is saying. But without scaling games would get boringly easy after a bit. Just one hitting everything isn't fun in the long run. I think it's best when it's area specific. Both too give a challenge for low-level carecters and too prevent high-level carecters from become overpowered and boring. And if you feel like it you can go back to a low-level area and feel like a god for a bit if you like.