I thought about this as I was suffering from a cold/sinus infection... not sure which. In the past, I wouldn't hesitate to take Pseudoephedrine HCl, but as my BPH got worse and worse, it was crazy scary at how slow my urine flow would get when I took such that I could no longer take it. Fast forward to 6 months post radical prostatectomy, I was still avoiding the Pseudoephedrine. But why? I no longer had a prostate and I was suffering terribly from the sinus pressure. No reason not to so I took a 12 hour tablet and 30 minutes later, I felt so much better. The lack of a prostate helped me not to suffer from the horrible sinus pressure! Wohoo.
The other advantage is related to the above. I get to pee like a teenager again. I am still thrilled with that and yes, it only happens on command thankfully.
The next advantage is the future need for any abdominal surgery. Radiation damages tissues and changes the anatomy making typical surgical planes and landmarks far more difficult for the surgeon. Abdominal surgery post prostatectomy is more difficult and risky. Prior surgeries also adds risk due to scar tissue and adhesions as well. This particular risk skews in favor of radical prostatectomy for younger men as they have this limitation for potentially a longer period of time than an older man undergoing radiation treatment and the need, perhaps, for abdominal surgery, unrelated to prostate cancer, in the future.