I was just wondering what the author had in mind. But now that you ask, yes I think it does. Without a suggestion the opinion is pretty much worthless.

You really think we shouldn't criticize things if better alternatives don't currently exist? The fact that someone hasn't come up with a better approach doesn't imply that the status quo is the best possible solution.

Absolutely.

Here's an example: Human mortality sucks. However, since there is no alternative, complaining about it is an exercise in futility.