Because that’s a big if. Plus, I’d expect the majority of people who get “unflavored” protein actually end up adding their own flavoring when they mix up each shake, which adds time, energy, and sometimes calories. Metabolic Drive has literally won awards for tasting great.
Nope, no advantage. Grass-fed beef’s primary benefit is an improved fatty acid profile with more Omega-3s and a better 6:3 ratio than corn-fed. But because protein powder is obviously processed and designed to only extract protein from the milk, none of that healthy fat ends up in the finished product that you shelled out the extra/wasted cash for.
And that’s all presuming what you get actually comes from legit grass-fed cows, not grass-and-corn-fed being passed off as strictly grass-fed, which is common.