Opps, maybe I should clarify.
Parky, is no longer "margarine" it is a "spread stick" (65% Vegetable Oil Spread). It has been for quite a while now. If you look, it will be very difficult to find a true margarine (80%Vegetable Oil).
Does the small amount of enhancing ingredients matter..in my experience, yes. I intentionally use it in small amounts to manipulate recipes all the time. Even the small amount of lecithin in Pam spray that I used to coat my bowl to allow dough to double, improves the texture of my yeast doughs. It tightens and softens the crumb. It's one of my "secrets" so to speak.
Hopefully I understood your question correctly. If not please let me know.