Personally, I enjoy sharing the island with Animal Crossing Items my wife and daughter. I definitely understand wanting you to yourself too. As always, more flexibility and options are always better.
Yeah, if both players were equivalent owners and could"advance" the island evenly, it'd be fine. I've got it and my daughter is your island proprietor so there's nothing I can do unless she goes and does exactly the quests. It is pretty stupid how they have it setup.
And he is tackling a specific point made in the article.