"2gypsies".....When your 2004 Dutch Star was built, it most likely had a split bath, since that's what everyone wanted at that time. Now, people want a large rear bath. In order to do that, you have to offer a second bath you can use while underway.
So here's a question....if you went back out on the road today and ordered a new coach, would you order it with propane light fixtures, hand pump water system, porta potty or stool with a bag, no microwave, incandescent bulbs and a Dodge 440 engine? Probably not, because things change, people demand more and better systems, modern technology and floorplans that are more useful and fit their needs.
Ours has a half bath primarily because we have a full bath in the rear and can't access it while underway. Our previous coach, 05 Diplomat, had an all in one bath (side aisle) and that's the way we like our bath set up. We never cared for the split bath. More and more people are done with the split bath when they realize they can get a large luxurious bath.
Now that we have it, we find it very convenient. My wife goes to bed earlier than I do and I don't disrupt her when I use the 1/2 bath. We were on a trip to San Francisco when we both got the 3 day flu. It was great having our own bath.
Times are changing, don't discount something just because your RV doesn't/didn't have it. Just like having a fireplace....we laughed when our coach came with it, but now we love the ease of quickly warming the coach without turning on the coach furnace or dragging out an electric heater.