why has my orgasm feel less intense after my prostate surgery?

That was my experience too. The first one post RP was one of the strongest I ever had. From there it was all downhill to micro orgasms. To the point of why even bother. I view it as the "new me" and accept it. I have a full life otherwise and it will be even fuller once through ADT.

I'm 71 and just over 10 months since NS RARP. I've found that my physical sensitivity is not yet back to my pre surgery level, although it is getting slowly better. Frankly, I believe before surgery my sexual experience (including the quality of the orgasm) had a more significant physical aspect than they do now. After surgery, I've found the mental piece is much more important to the quality of the orgasm (or even if I have one) because the actual physical sensation (I assume due to the nerve trauma) I have during the sex act still isn't back to pre-surgery levels of sensitivity. So now my wife and I do a lot more foreplay and cuddling before sex and even during the sex act as I really have to have my mind in the game if I hope to get a satisfying orgasm. I can't simply "jump into sex" like I could before the surgery and let the physical side do the heavy lifting. That said, if I do get my mind in the game then the dry orgasm can be very satisfying. But I suspect this kind of advice is probably outside the scope of urology, and I probably should have sought some male sexuality kind of therapy/advice after the surgery. Unfortunately, I think this aspect of rehab is often not discussed during the routine post-surgery medical visits, but rather left up to the patient to figure out and/or to request help. Long story short, my wife and I had to adapt our sexual experience to figure out what works for us post-surgery. For us it definitely changed from pre-surgery and we're still trying to figure it out. Of course, I'm not a medical professional and maybe I'm totally wrong. But that's been my experience so far. Here's a great video on sexual function given by a doctor at Sloan Memorial which gives a lot of specific statistics including the one you asked about. Interesting, they found 10% reported better orgasms after surgery, while the numbers for "about the same" and "less intense" were 40% and 50% (although I don't remember which was which). It's a pretty good video. It has a great chart on how long it can take for the nerves to fully "wake up" (2 years) so watching it gave me hope that my recovery isn't done. Best wishes.
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Here's another try at the video link I tried to post above: