Could everyone with just one foot please raise their hand? Yes, I know some people DO only have one foot (or less) for a variety of reasons but I think it is safe to say most people still have 2. So why build a lovely foot dome (something I know some may not care for but which for me was a short coming of the 385) and then only put one foot jet per seat in. That is the way the 365 is built as well.
Seems strikingly odd to me and a feature I liked about my spa, which has 2 per seat, as does the Sundance Optima, Dynasty Voyager and Emerald spa among others for example (although a sister tub, the Vita Nuage is built with only one as well).