Doesn't the browser native messaging feature already provide the ability to call native applications and create a backend language API? I guess I don't understa

Doesn't the browser native messaging feature already provide the ability to call native applications and create a backend language API? I guess I don't understand the need for every app to basically have its own browser engine, no matter how "lite", when I can already develop apps with Chromium that use native messaging. I'd rather see a unified solution which pretty much exists then to have a bunch of alternatives that provide no greater benefits overall from what I can tell.