I think I may have misinterpreted what you said. I thought, in your last paragraph, you meant that the question was whether the critiquer actually has the ability to discern areas of improvement or not. I was disputing whether that is important or not. As has been stated many times, the greatest benefit a beta reader can provide is to point out if something works or not, not necessarily how to fix it.
I think there's too much noise in critiquing, and that some people need to stop doing what they're doing. Some people make it harder for everyone else.
(I'm not saying that about anyone here, or about anyone in particular. But I think we all have seen examples of people who give bad critiques.)
If what people want or want to say is "I like this, I don't like this," there's ways of doing that, too. I think Phil posted something about that a while ago, where you go through the text and insert specific labels like (+) and (-) and (?) and nothing else.* I don't mean to invalidate an approach like that, for instance. It's efficient, and doesn't pretend to be more than it is. It doesn't offer the kind of feedback you can get from an experienced writer, but that can be okay.
But that's different from grabbing a few bad sentences, viciously explaining how awful they are, and simultaneously giving someone the impression that it's all they need to fix because it's what you spent six paragraphs typing about. That kind of critique is just wasting everyone's time. So is a critique that imposes one style onto the writing of a different style that just isn't compatible.
Some people talk out of their ass. And not doing that is a requirement for the approach I was suggesting, of talking about three broader things to improve at a time, which I think is a good approach for a community of writers. That's all I was saying.
*I don't remember what the exact symbols were.
No two writers will write anything exactly the same. They employ different techniques and go about achieving engagement differently. Personally, I think tension is the most important element in making my work interesting. Robert Bevan would probably say it's humor. It would be stupid of me to presume he needed more tension when he really needed to make a scene funnier.
I happen to agree that building tension is one of the more important things you need to do in your writing. But it's not a blanket statement. There are reasons that tension works, and understanding the first principles behind tension will help you understand what kind of styles need to use it more than others. You mention Robert Bevan and humor, but tension can be a fundamental concept in many types of comedy, if it follows the setup/payoff cycle that many comedians use in their work.
That is, even a style as divergent as comedy can be learned, at least enough to give a helpful critique.
