Your very right, but, in addition to no bedding, the brooders are cold and a serious crushing hazard.
Its compltlty natural for chicks to pile up on each other while sleeping, it means they are getting warm and comfortable. That is natural with the common clutch of 3-12 chicks under a mother then, these brooders have up to 50 chicks. When 50 chicks are piling on top of each other, its a serious crush gin hazard, and many people have seen the consequences, which is crushed dead chicks.
Plus, I'm sure the brooders worked find in the test site, but when you put them all over the world, different climates have different weather. Drafts, temp drops, etc, etc.
Its gonna take modifications to make the brooders work in each different climate, which they aren't making.
I am copying information from another person who explained these risks in a video, but thought I would recite them here if others haven't heard them yet.
I'm sure that certain TSC's are doign great with thee brooders, because the climate is correct to keep the temp at the correct temperature.