Ok so it seems the biggest problem everyone is having with my post is the term I used and I apologize for that, and yes I was talking about control/contraction joints. I also think it is unnecessary to call someone ignorant or lazy and that is all I will say about it.
To go further on this the I posted prior to seeing the property and it was a question from the buyer realtor and I was mainly asking to understand why a builder wouldn’t put in the control joints. Further to this when the property was inspected it was discovered that the support posts were bolted directly to the concrete slab. Further it was discovered that the concrete slab construction is a “Waffle Slab”, more information can be found here; https://www.cornellengineers.com.au/beware-waffle-slabs/. Thank you to all of you who provided comments most of them were helpful.