Maybe, but many people that used to use Sketch are now using Figma. Adobe is doubling down on XD, and Framer is also rapidly turning into an extremely powerful tool.
It's pretty impressive that a browser based app can compete with such a complex and performance sensitive app like sketch. I understand why sketch is a native Mac app but having no windows or Linux port leaves the door open for competition.
Interestingly, my issue with Figma is just that—it feels slow and clunky to me, I imagine largely because it has to run in a browser. Surprised so many people prefer it.
For me it's the other way round. Figma canvas is silky smooth while Sketch drones on.
Figma is rather performant (to the point where it outruns Sketch in typical day-to-day design tasks), and their vector-editing is less buggy.