The number of reckless and conservative stance pieces that make up your stance meter are determined by your career, which means that all characters with the same starting career have the same sort of outlook/attitude to begin with.
Now I can see a couple of issues with this. First, some players may well want to play a cautious thief (for example) but are stuck with a stance meter that's 3/4 reckless. It seems to me that the stance meter is dictating a particular playing style to a certain extent.
Secondly, some careers will have very different personalities depending on the exact build. Priests for instance, I'd expect a priest of Ulric to be considerably more reckless than a priestess of Shallya. Or a bright or amber wizard compared to a jade wizard as another example. Is this going to be taken into account on the starting stance meters?
Obviously, how you choose to interpret your character is completely up to you. But are your actions going to work anywhere near as well if you keep to a cautious stance when your career is geared towards a primarily reckless outlook? Are you just going to be limiting your in-game options by choosing to roleplay outside the box?