Offering different options for Safari, Mail, Photos, etc, just indicates to me that they are no longer able to design a proper UI. I mean, Apple used to make products that work right out of the box. The magic touch was simply a thought-out user experience that was easy to understand. In the last few years we have seen changes, seemingly for the sake of making changes, then reversing those changes in later updates, and now they're just offering three versions. If they were really learning from past mistakes, they could make the right decision and go with one good UI.