I wouldn't put wheys profile on such a totem pole even if we can replicate it exactly in a vegan form. Just because it has the most essentials doesn't mean thats the amount of essentials a human requires. I think one of the reasons its such a successful product is that its so cheap and people know they can take as much as they want because its so cheap.
How do we know how many essential amino acids a human requires? I looked for this and couldn't find anything. I'm trying to think of this logically. Here is an example:
If I eat
200 grams of protein per day of Gemma Isolate
200 grams of protein per day of "Protein X" (of lesser essentials)
I'm getting more essential aminos for my "pool" by consuming the Gemma than I am if I consume "Protein X". So even though I am consuming 800 calories of each, I'm getting more aminos per calorie, which would be nutritionally more dense, no?
Another analogy would be eating 200 grams of Kale vs 200 grams of Iceberg Lettuce, wouldn't we want to opt for the more nutritionally dense food choice?