I certainly don’t have anything against Sketch. It’s a lovely drawing tool, and I admire they way the team has kept it focussed on the essentials rather than sprawling in every direction (which Adobe inevitably seems to do with its products — does Photoshop really need to contain a video editor?).
Yet Sketch doesn’t really do anything to help model user experiences in the wider sense. That will require a paradigm shift, and it will also require learning something new (Sketch intentionally treads on familiar territory).