Not sure about this myself but something to consider.
What is the protein content of say 10 eggs, how convenient are they to cook, carry and eat?
How much powder do you have to mix up to get the same protein value? how convenient is it to carry, eat and consume?
I use whey powder as well as eating eggs, meat, fish and nuts in large quantities. I use it for convenience at times of the day when eating half a dozen eggs is well... Awkward.
I'm no bodybuilder, more... Long term in training. I don't lift weights to look stacked or get ripped, just to be stronger and fitter and I g