Insane. Using TWO Apple products together should NEVER be difficult. Now, for quite a while I had my iPad Pro extending the desktop, and this was happening without me even trying to make it do that. For a while it was convenient and I like it, for the most part. But, I turned it off, (cannot for the life of me remember how I turned it off), but ever since turning it off, I CANNOT get it to start up again. Nevertheless, it should NOT be so hard, hours wasted trying to get it to work again.
Apple doesn't "play" nice with competitors, but let's face it, they don't play nice with their own stuff either. Users of a completely Apple "eco-system" should Never, Never, Never have these sorts of trouble, and certainly, if it does happen, they should have a SOLUTION immediately, but NOooooo...