Although I agree and disagree with parts of this statement.
A compound fracture to me is extremely painful, the break is clear and it's a fair call to make this decision.
But other factors play into a decision when putting dogs down, will it be a pet, breeding etc. Are other factors at play? Suitability for rehoming? Cost of injury repair.
I was in this situation recently, broken hock, plates and pins not suitable, only surgical option (through a specialist) was arthodesis. ( plating the whole hock to be fused together and never use again). Quoted price for surgery, 6k plus 12 weeks recovery and regular xrays to check healing speed. This was not feasible to anyone getting paid on only race earnings while covering a team of dogs.
Your making it sound easy to return a dog with a genuine wrist break, it's not.
Greyhounds carry 70% of their body weight in their front legs. That's a lot of, not only weight but force while running to carry through a wrist break.
I've had many retire to less In the wrist/stopper than genuine break. In fact give me a hock or gracilis any day over a wrist injury.
Featuring mingming my now 3 legged house pet