There was Sketch before Figma, and it was great... if you were running macOS. Then Figma ate its lunch because they were able to support viewing and editing on every platform, and didn't require downloading and installing an application just to review and comment on designs.
Those advantages are only possible by either a) having a massive engineering team that can build applications for every device and a lightweight web app or b) building for the web.
Being a web app that runs everywhere and is always up to date is a big part of Figma’s success. They’ve already crushed a very strong native desktop competitor.
But let’s not jump from this to the conclusion that everything on the web should be built this way. There’s a place for things like Figma too.