Many people participated in the trials of the Dream Shadow Cave, even martial artists who usually avoided such challenges actively sought to join.
Aside from testing their luck and discovering if they possessed innate talents in this regard, another significant reason was that the trials in the Dream Shadow Cave generally did not pose a life-threatening danger.
Failing the trial immediately resulted in being transferred out of the cave, a practice that had been upheld for thousands of years.
Alternatively, if one sensed imminent danger, they could choose to abandon the trial and would also be relocated outside the cave.
Thus, the dozens of Combined Aperture Tempering realm cultivators on the battlefield initially had an exit strategy, which was to concede and leave the Dream Shadow Cave.