A lot of novels I've read where MCs get a disciple, but are soon forgotten/swept aside after just a few chapters, which I'm not a fan of tbh, so please help me out if you can. I know of History's Number 1 Founder and Library of Heaven’s Path already. EDIT since title seems to be causing confusion = Sorry i didn't know what the correct term is used when referring to Chinese Martial Arts novels.
History’s Strongest Manager Not sure if it counts and haven't read it myself but sounded like it'd fit.
I don't think you have read any Wuxia novel, at least the 2 that you named Weren't Wuxia.... But though, disciples in Xianxia are like "Treasures". The MC had uses for them or made up whatever reasons there were for them to "take on" disciples, and then they are "cast away" after they have done their "uses".
They are all martial arts novels but with different levels of fantasy and power levels. Wuxia is the basic or mortal one I think. I read about it years ago so J might be wrong.