Spoiled meat???
I think you missed how quickly I am able to put my venison on ice.
If I didn't have to benefit of a skinning shed and running water, I could understand field dressing.
And the way I skin a deer, the piss sack is never an issue. I hang my deer upside down. Back straps removed first. Then shoulders are removed. Next are the loins. Then I debone the hind quarters.
I think Ray Charles could avoid the piss sack this way.
In well over 25 years of skinning deer, I've never had an issue. And not to boast, but I think that qualifies me as a subject matter expert.