Simply provided a potential solution to a question that was asked.
As far as a call being something different, some might treat it that way, while some don't. Many also don't want to be randomly interrupted in the middle of something they are doing on their device just because someone decided to call them at that moment.
Ultimately it appears there's an option to have it still function as it did before, which makes it an improvement in that there is still the way it always worked and a new way that doesn't interrupt things for those who wish to make of. For the moment it seems that the implantation is to connect it with the existing notification system rather than necessarily bringing a whole new and different UI/UX. Could that new option be improved in some fashion? Perhaps, as is the case with many things (even beyond iOS), and perhaps that will happen.