I would not call Lae'zel shallow. Focused is the word that comes to mind. In a way she seems to be the most caring of all the companions we have got so far. While her primary concern is not to turn into a mindflayer she does not seem to be motivated mostly be egoism but a genuine wish to protect her people from their former oppressors.
The tendency to only see characters with deep internal conflicts and flaws as interesting is perhaps reflective of certain tendencies in todays culture. I do not mind such *complex* characters but I do appreciate efficient characters with great self-control. Sometimes it is as DaVinci said: Simplicity is the highest form of perfection.
I am pretty certain that more 'good' characters both male and female will be added to the game. Larian wanted more feedback on the neutral and 'evil' ones in early access.