If it's entirely optional sure, but honestly I think I'd be kinda annoyed if they tried to prescribe even more of a specific personality or thought process than they already have. There are already things you can't avoid or can't dialog choice your way away from that annoy me - specifically the off handed comments a lot of NPCs seem to make about how oh, you're not interested in [insert technical ramble, political or historical facts, anything at all that you could be interested in beyond Stab Thing Real Hard] because clearly the WoL is just a dumb adventurer right? No, sorry, I don't buy that.

I love that they've been adding a bigger variety in the dialogue options we get, even if they don't change much other than a few lines of dialogue, because it means I can build on my own ideas for what I think the character I've been building is more likely to say. I already have a story and personality built up around the blocks they've given us to describe the type of person my WoL is, and adding more specific personality details on the game side would really just leave me with less freedom to play with than I've had for the last 7 odd years of playing this game.