Wine requires no more installation than Electron. There are lots of "pirated" releases for macOS/Linux with a bundled copy of Wine (sometimes with third party patches or some libraries swapped out).
I can built a basic app with html, javascript, etc that supports many platforms in an evening. How long do you think it would take to support windows, macos, ios, android, xbox, linux, etc, etc? Much more than 50x the time even if you already are familiar with development on all the plaforms.
too many gotchas with LGPL to become a universal solutions. I wish that gtk was more stable across all platforms. I have a few on macos and some are less than ... stable... compared to on linux.
Hell even Wine is more efficient an approach for cross-platform distribution.