Do not assume that after Shi Xiaole has understood a tenth of the realm of intent, low-ranked martial arts would become obsolete to him.
In fact, with Shi Xiaole's current strength, status, and even background, even if he gets techniques from second-ranked martial arts, he would not dare to use them openly.
A common saying is that the innocent can become guilty if they possess something valuable.
In the Cloud Triangle region, second-ranked martial arts are equivalent to peerless martial arts. As soon as others get a whiff of it, there will be a bloody storm.
Currently, Shi Xiaole is not capable of protecting himself.
However, it's a different story with third-ranked martial arts.
This martial art can be considered powerful without being so rare that it invites coveting. Most of the stronger sects possess it, so there's no need to worry about attracting others' envy.
Most importantly, the realm of intent is Shi Xiaole's trump card, which he can't use frivolously.