Youre asking why the recipe you are following, using home methods, isn't the same as the commercial example......... you need to consider that the process between a 30L batch and that of producing many megalitres is going to be considerably different. One of the experts such as Thirsty or Mark can probably clarify, but I was of the mind that for one thing, commercial breweries would go for a far greater conversion efficiency that is practical to you & me in our shed.
So basically you're saying that it's not possible to produce the same result at home using an identical recipe?
If that's the case, then as others have suggested, I might try a different recipe.
I'm still interested in the differences in commercial brewing processes that can't be replicated at home.