@Matthias401,
IMO, the split feature doesn't work as it was originally advertised which was to offer guests choices to stay in two disparate spaces within a specific geographical location to get richer experience of the destination. I've seen recommendations for two spaces that are next door to each other or located in different countries or islands. For example, St. Lucia and Martinique are just 22 nautical miles apart, and both have a French colonial, but there is not governmental connection nowadays. Many people think all islands in the Caribbean are part of the same country like the Bahamas or the Philippines, but Martinique is a French overseas territory and has different entry requirements for travelers than St. Lucia (still a member of the British Commonwealth). Just imagine how guests may feel when they've booked a recommended split holiday, and find that they can't travel to one of the destinations, because they thought they were visiting the same country only to find out that a visa and health travel insurance is required for one location.