Irrelevant of what they say. They are a company and thus is there to make money.

One of the ways to prey in the attachment of people for in game housing. It was designed this way in purpose. As it would have been trivial to implement instanced housing (if they implemented a personal Island, they could have implemented instanced housing on the island). This confirms this was done by design. Otherwise, the problem would have been fixed with instanced housing on the Islands.

At the end of day. Don't trust their word. Their word means NOTHING as is a company not an individual. Instead check their actions. That's what matter.