But it's the opinion of the article author - the article that is being linked to. And removing this makes the title nonsensical.

Unless the title is too long or is obvious scummy clickbait, IMHO titles shouldn't be editorialised.

I found the headline here actually incomprehensible. Had Microsoft built Windows 11 on top of WSL? Built part of it that way?

What you'd means is "Windows 11 includes a revamped Windows Subsystem for Linux" if you wanted to removed the editorializing. But the article is editorializing - they don't like the rest of windows 11 and say so.

Without "the best" the title reads to me as that they somehow removed chunk of original Windows and replaced it with WSL. That's why I came to this topic. I thought to myself - really - so they now replacing windows code with Linux? Original title is clear and not clickbaity.