I think level 4 is a really good level cap for EA currently. Its super easy to do all of the fights over-leveled Above Ground without actually trying, but once you get to
the Hag (When she's not bugged...) or the Underdark, things get way more difficult. The Gith patrol is actually pretty challenging if you're not expecting them to attack you and didn't preemptively take high ground.
It's really just a good balance for testing encounters currently, and a spell like fireball would oversimplify a lot of them.
Should they take a different route than they did with DOS:2, and continue adding content, then yeah anything past where we are would hopefully start needing more tools than we have access to right now.
