CBTL, have you answered the question?
Would shared leave aid the decompression process?
Consider there are 3 people.
One is single and hopefully will spend the PODL with friends and family.
Another has a civilian spouse who may or may not work. In the latter case decompression may take place as a couple.
Finally we have the married serviceman. The PODL dcompression may well be wasted if all they have it the 4 walls of a quarter to stare at while their spouse continues to work. Worse, that spouse may then go OOA not long afterwards.
What of the principle? Would some people want it?