Releveling skills

So let’s ask the question, for those of us that don’t know the answer (maybe that’s just me).

Why is the re-leveling skills in the game? It seems to entirely be about guiding player behavior, but I’m honestly not sure.

And, for reference, leveling skills makes sense to me, it’s part of the character (and, the first time, player) journey. It’s just re-leveling that leaves me wondering why. It feels like pointless busy work.