I don't think their suggestion was "just do what chrome does", it was "make your browser indistinguishable from chrome so that Google trying to create a seperat

I don't think their suggestion was "just do what chrome does", it was "make your browser indistinguishable from chrome so that Google trying to create a seperate browser standard breaks websites for other browsers". If a website can't tell my browser apart from chrome, it can't attempt to support chrome-specitic features based on the user agent string.