They had to undergo a tempering cycle to temper their state of mind and gain experience in battle, Angela and her martial siblings didn't need this type of training because they had undergone it countless of times.
The elites have also completed their early training and they are only using this opportunity to sharpen their minds and blades, they are no longer required to battle against the evil cultivators.
On the other hand, the new members of their sect truly needs to undergo such training, most cultivators on Martial Beast Sect are body tempering martial artists/cultivators.
Don Don might create or obtain large variety of weapon techniques from Gaia and the worlds that Murim World have conquered but their main focus is still the body.
The progress of a body tempering cultivator might be slower compared to most cultivators but their foundation and strength are certainly one of the highest.
