The problem with electron is that it's really limited to the platforms it supports and it's almost impossible with reasonable effort to port it to anything else.
Porting electron is an immense effort, and it requires serious computing power to compile. Well - like chrome. But chrome is for all users of the OS, while Electron is usually bundled with the application because every application needs another version. This multiplies the effort.
Therefore more niche OS like OpenBSD are locked out by electron.