Yes. You just show up when you want to. We actually prefer traditional dining, as we like getting to know new friends. And, it takes more than one meal to connect enough to even begin a friendship. But, we also enjoy the alternate style, too, so it's all good. Just FYI, on the Legend, you can start with traditional, then change to open dining, but not back again. Guess they don't want to confuse the waiters!
P.S. We have sailed the Legend many times and it is one of our favorite ships. If you like sushi, there is a free sushi bar almost every night.
I did the "Your Time" dining on Carnival Liberty last year and I loved it. It was great. I loved meeting new dining companions every meal. Since I am single and travel alone most of the time it was ideal for me.
“Twenty years from now you will be more disappointed by the things that you didn’t do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.“