I have the opposite opinion - if criticism like this is so obvious (and it is), then it's up to the article to refute it immediately - this saves time of everyone reading it and gives it more credibility.
You can tell who never looks studies up on scihub because they have no idea that multivariate modeling for confounders (especially income and education) is something pretty much every study does, so it makes no sense to assume you just blindly outsmarted the study when you thought of the first confounder that came to your mind.
Yet it everyone else's responsibility to defend casual mention of every study from a critique you came up in 5 seconds.
And everything else was held constant? Moreover the claim isn't that you need absurdly high amounts of protein to build muscle, just that it's easier to build muscle if you have higher protein intake, all things being equal.
It's like when you hear that steaming vegetables retains more nutrients than boiling them so everyone repeats this bit of trivia, but then you find out it's talking about a 7% difference so who cares.
I do think proteinmaxing is mostly food/supp industry hype + advice for people who need to tricked into replacing donuts with something healthier. So YMMV.
But I think the training until exhaustion part of your comment is the important bit.
There has to be some incredible correlation between having the time and money to play tennis “a few times per week” and being significantly wealthier than the average person. And being wealthy is clearly the healthiest thing you can do.
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How many of those questions do you feel is adequate to pre-respond to any time you link a study? Especially when assuming incompetence on the person asking the question thus you can't possibly know the questions they are most likely to ask (since they're incompetent)?
And if I'm incompetent, why would anyone trust my summary and pre-responses to the study?
None of this makes sense. And we're getting awfully close of just pasting/linking the study so the person with the questions can just read the dang thing.