Absolutely not window dressing to the SA, who wanted a "Second Revolution." There was an element of the Nazi Party that put "socialist" and "workers" into NSDAP. Now, Hitler was not part of that element, and that element lost out, violently, in 1934. I've made that distinction.
And why this element lost out, or rather was mercilessly purged and literally destroyed? To allow a permanent alliance between Hitler and business/military establishment. Hitler used those people you were talking about to gain power and then dumped. Very left wing of him