The other reason is that many of the companies that ship Electron apps are web-first companies. Slack, Discord, VSCode, Github, and Notion were all solely web apps at first — some for years — before any native app was released.

To these companies, a "native app" is just "a web app with its own start-menu icon, no browser chrome, and access to OS APIs."

(In other words: if PWAs had access to all the same OS APIs that Electron does, then these companies wouldn't ship native apps at all!)