Exactly. Apple needs more killer apps for iPad. With the Pencil, touch, LiDAR, and Pro Motion display, iPad is the best platform for design… but it’s potential is unrealized. Plus, otherwise PC-only companies already buy Macs so that designers can use Sketch. iPads are easier for companies to buy & Apple would sell a lot of them if it brought a UX solution to iPad.
I’ve used Sketch, Figma, Adobe XD, InVision and am generally unimpressed with these as prototyping tools. They overemphasize pixel perfect screen design & under solve the most important UX task: documenting the end-to-end workflow through a user task. My favorite prototyping tool was App Cooker, a workflow-focused app for iPad that sadly got acquired and discontinued. There’s a ton of room for innovation in the design space.