There's also one other perspective:
Content of EK strives that can be completed at L20 (or a bit lower).
We also had hard cap at L25, which is now removed by popular demand.
Leveling past L20 is doable, but is pointless from content perspective.
Also, not to forget, gaining levels influences not only skill and trait points, but also how traits and/or skills function.
I understand what you're saying, but I'm anticipating when David adds new content from time to time... and the possibility (hopefully) that if David makes a sequel that the character from EK 1 might be imported into a new game?
Gaining levels changes the trait and skills function? In what way?