What's the main purpose of it? When would you need it to face a different way that would warrant the cost?
Indeed there is a cost to it.
I have had many request from different people as it makes the set-up easier. And I am one of the person who thinks it would be ideal.
When you show-up for an event there is always something in your way and people never realize the space you need to position the trailer just the way they want it / envisioned it. Rarely it is an open field just for you to maneuver your 10' long trailer with your big truck.
You can't move a 5,000 lbs tandem trailer by hand. If you are able to back it just right and then go park your truck, then hitching it back-up can be a nightmare.
John and others can put in their feedback on the matter.
With a rotating platform, you can pretty much pull or back in, turn it and get your oven to face right where you need it.