I'd be surprised if anyone but the oldest non-technical users had any idea what the "www" was or why it would or wouldn't be at the front of a URL. It takes zero technical knowledge to understand "en" indicates the language and probably rarely comes up since you can use www or omit the en and links mostly just work.
They might wonder (although I doubt it), but it’s nothing actionable.
With m., they used to see a mobile layout that’s a really poor fit for a desktop screen and that they would have manually switch out of via some relatively obscure button.
> Wikipedia’s use of it is surprising to our present day audience, and it may decrease the perceived strength of domain branding
Really? That’s the reasoning, and not the fact that mobile links forwarded to desktop browsers would render the mobile view?!