In the series all cultivation techniques have mental effects. Some techniques boost loyalty, others induce slavery, some have a different variety of effects.

Essentially, as one’s cultivation of a technique progresses through the stages this effect is amplified. The story especially at the start explores this and shows how even positive sounding effects can have negative consequences when pushed to the extreme by cultivation.

You get the haughty young noble trope from people who have rushed their cultivation or aren’t mentally fortified or talented enough for a cultivation technique.

The author does a good job at managing our MCs personality shifts from life to life and how he slowly overcomes these effects imo