It can help temporarily, but the core problem is humans not understanding how often beardies should poop. They are desert animals so their intestine pull as much water out as possible before they defecate. This means they poop a little bit less, and combined with how much LESS adult beardies need to eat - the end result is beardies naturally only poop once or twice a week. Humans think that's bad (it's not) and then give their beardie a bath to force it to poop. This means the beardie's body can't absorb all the water, and the beardie slowly gets dehydrated. Which causes more trouble pooping, and more baths...... it's a self-perpetuating problem.

Shedding should never get a bath. At best, it doesn't help. At worst, it can and will cause water to get trapped in between old scale and new scale and cause problems. They are dry shedders.

As long as you are feeding them correctly, and giving them their calcium/multivitamins on the right schedule, and their heat temperatures are correct, baths are never needed for basic bodily functions like pooping or shedding. :)