With ChromeOS you get both.
I have used Linux for 20 years, but only for development, and I will only develop on Linux.
For everything else (email, files, photos), I want a browser. Used to be Mac/Osx, but got tired of being managed by it.
Just my preference. You can do everything on Linux, just never felt comfortable with it.
You want a browser for files?
Sure, but I'd never want that browser to be Chrome. Extensions, especially ad blocking ones, are important.