Drecko Shearing/Egg room - why?

https://preview.redd.it/izaixg4wexih1.png?width=869&format=png&auto=webp&s=14ce46dd388f6db47374766ab26948782d8e0e06

I might be missing something here. I was under the impression in the extra room, the dreckos would continue to grow their coats until they died of starvation. This isn't the case! I get one shearing, then I wait until the game decides to stop accepting drecko eggs here, or I manually cull.

This sound about right? If that's so, then what's the point of the H2 atmo?