Nothing is wrong. They just don't use MTE yet, they probably have other priorities. They wanted to save some costs until they will use MTE, so they removed some hardware acceleration and downgraded the GPU. Simple as that.
So, I don't think it's accurate to say they don't use it yet. They were using it, and then they stopped. I think that's one of the reasons the linked GOS thread says they're concerned that "MTE may actually be broken due to CPU errata".
The thermometer was nice too if you have kids.