yes true - a lot depends on the integration in that scenario though. Can I seamlessly copy and paste rich content between the, drag and drop, does the mouse seamlessly move from my Mac desktop to the safari window next to it, etc.

At a deeper level it depends a lot on the question of does Apple want this? If they do then all these will be solved over time. But if they actually see MacOS as a legacy integration then they simply aren't going to invest in encouraging people to use it. I'm waiting to see indications on which way they are going to play it.