This is an excellent essay that concisely articulates a very complex/multifaceted ideology
I do disagree with your assertion about Social Democracy's relationship with capitalism. It offers more than a forceful critique and re-arrangement. My view is along the lines of what Anthony Crosland articulated in the Future of Socialism but with a revision: if we can use capitalism for social means through the democratic state, what is truly being advocated for is total state control of economic means for utilitarian ends. We, as social democrats, only tolerate capitalism so long as it proves to be an effective mean to generate mass wealth.
That was the original view, but this isn't really the case any more.