A few things to consider.
#1 - A meal is ENTIRELY different than a protein shake. Food will take substantially longer to digest than a protein shake, which brings me to #2.
#2 - Gluconeogenesis. Look it up, I'm not going to fully explain it to you, but basically, after a certain amount of amino acid assimilation, your liver will determine that your body is saturated with amino acids, and it will process the remaining amino acids by converting them into sugar. Yes, that is right, your liver will turn excess proteins into carbs. Exactly where that point is, will be largely individual, but a safe ballpark number would be about 30g/hour. That means if it only takes an hour to break down a protein shake, then to avoid gluconeogenesis, you should keep the shake at 30g or less. But a steak, as was already pointed out, will take upwards of 8 hours to fully digest, so you could conceivably eat a steak with 200g of protein (big-ass steak) and still actually use all of the amino acids for their intended purpose, instead of storing any as glucose.
#3 - Do whatever you want, but don't expect the "American RDA" to EVER be able to give an accurate recommendation, because it's a blanket statement for the masses and based on a study paid for by somebody. Figure it out for yourself. If you look like Dexter Jackson on a vegan diet, then more power to ya. I'll keep eating my steak, chicken, fish, and any other meat (besides FD's tubesteak) that I can get my hands on, because I've learned that THAT is how I grow.
