To each his own
We have GM and Ford vehicles in our fleet. And the ones that look like the one in the picture are almost always the ones that NEVER had the coolant serviced.
That thread is 5 years old, by the way. And the car in question was 3 years old at the time.
I suspect that the DexCool formulation has changed since then, no matter what GM may say.
I guarantee you there are no 3 year old GM vehicles in our fleet that have Dexcool that degraded.
At least not the ones I looked at.
And that’s been hundreds.