If all you need to do is display a native dialog, read some files, etc. you're better off without the massive 300MB game engine. A lot of people making native apps aren't game devs and a lot that are aren't making tripple-A games.

In the same way there's definitely web apps that are better off with a large framework, but if all you're doing is toggling some classes you're better off without them. Most websites don't need to be SPAs.