Well Tony I guess it's kind of like the saying...
"One man's trash is another man's treasure".
I guess the single biggest reason could be summed up in a single word which is family. Which is also the biggest reason I chose the commander to be my next boat. My wife sails with me most of the time when I sail. And a private head for her is very high on her list of necessary requirements.
Also I have two grown daughters. One of the main reasons for the commander was the large cockpit which allows me to take my oldest daughter and her husband and our two grandsons sailing with my wife and myself. And when you have that many folks on board you need a private head area even more.
There are however many other reasons for my choice and here are a few.
1.) I really dislike the post in the middle of the access to the v-birth. A lot.
2.) While per your post it may offer a handhold the edge of the doorway can do the same while allowing me to carry things into and out of the v-birth area much more easily.
3.) The partial bulkheads in the commander seriously limit what one can do for built in storage. A bulkhead that goes all the way to the deck will allow me much better options for the sink and stove and storage of galley items.
4.) We cruise a couple of times a year for a week at a time and we have another couple we sail with. The new bulkhead and curtain for a door will allow a little more privacy for us and our friends to get ready for bed and dressed in the morning.
5.) My previous boat had a strongback and it functioned flawlessly. I really liked that setup and I have no doubt I can engineer somthing for this boat that will do the same.
In the end I guess it boils down to personal preference. There really is no "right" way just a matter of choice.