As far as I remember WoW was pretty decent at start. Level 1-60 was fine, but it got insane after they added 61-80. At 60 I think you had a few thousand HP and at 80 your HP already had gone into the ten thousands.
When you do Fort Joy at level 4 it is challenging or at least hard. If you go back there at level 6 enemies feel like pushovers, at least with full physical team and Ifans crossbow.
Even going into the deepdweller ambush totally felt different with just one level more.
This just means it kind of counterdicts the open level design because stuff feels locked behind level caps.
P. S.: Voidlings are just kind of free exp, though I would prefer if thougher fights would earn you more exp and not less than a voidling. The voidling 'ambush' gives you such an insane amount of exp and this fight got even easier, because voidlings don't seem to spread inflamable disease anymore.