Didn't know Sketch did cross-platform hand-off nowadays.
Yet, I still don't believe "most" designers use Sketch, except in some "niches" like startups for example, or really design-heavy industries. Probably differs wildly by country too. What I've seen used most in the wild is Figma and Adobe tools, a lot of times on Windows.
For feedback and handoff the web tool is free and works in any OS that has a browser.
https://www.sketch.com/handoff/