I think it really comes down to a matter of personal preference.
From a bodybuilding perspective, no, I don't think it would be any better of a protein source than WPI/Casein.
You mentioned cheap carbs - now I think in general that rolled oats and yams are better than cheap carbs in the sense that they're complex carbs. But for me, I use either Whey Protein Isolate or a Whey Protein Isolate/Micellar Casein blend and just eat oats, brown rice, or yams with it or add rolled oats into the shake.
The brand I use for protein isn't one of the cheaper ones - I pay a little bit extra for quality, taste, and bc you can mix 2 scoops (50 grams) in 3 ounces of almond milk and drink it like a shot - and I still could drink a lot more protein and consume more carbs for a lot less than a product like that would cost.
Now, I'm not knocking the product. That's why I said its a matter of preference, but for me, I prioritize budgeting for optimal results and even I wouldn't buy or use it.