Just like Feng Yi at the moment, while he's undoubtedly powerful, the strength of his power is closely related to enhancing combat ability. Without improving combat capability, getting slyly shot once can still be deadly, just like monks from hundreds of years ago who trained to have iron shirts. On the surface, hitting them once, ten times, or even a hundred or a thousand times seems to do no harm, because it's all about hard qigong, but if you catch them unprepared and poke once, it's certain death.
So, it's within reason that the troops are moving cautiously, after all, this elite unit represents not only themselves but also collective honor. They cannot allow mistakes in their actions to harm a super soldier.
Of course, if it weren't for our army's super soldiers, the enemy forces wouldn't be in such disarray. At least, the enemy doesn't have a fixed target, and with the coordination of this troop, holding out for a while is still possible.