Worth noting though that Figma is developed in C++ and compiled for the web, and they've stated that they're using Electron for the native apps for now, but it would certainly be thinkable and straightforward to switch to properly native apps.
Why waste time for little gain by going native than try to compete on features?
Think about iOS?
Cordova has you covered.
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Sketch also can’t do much more design-wise than you can with HTML and CSS, a good thing as it’s too easy to put things into a design with photoshop or illustrator that are a pain to implement.
On the other hand, it's a poor replacement for actual HTML and CSS as a flexible prototyping medium, and limits the visual possibilities for the parts that are not tied to CSS's constraints (e.g. icons, illustrations, backgrounds).
(From my admittedly short experience, Figma limits them even further, to the point that the only visual language you can accomplish with it is similar to Figma's own branding guidelines.)
Sketch also can’t do much more design-wise than you can with HTML and CSS, a good thing as it’s too easy to put things into a design with photoshop or illustrator that are a pain to implement.
The file format is basically zipped json files, so there’s a robust plugin ecosystem and you can do things like git integration pretty easily. And it’s a native Mac app, unlike Figma, its closest competitor, which is Electron.
It’s an example of simpler is better, especially when compared to Adobe software which doesn’t just include the kitchen sink, but the kitchen, the house and a large part of the street.