Unless I'm misremembering, I'm pretty sure it's referred to several times if Anderson was the original human councillor. But yeah, I know what you're saying, it does rather break the immersion when supposedly big decisions have next to no impact later on. Case-in-point, my renegade engie just did the rachni mission...an utterly meaningless decision, no?
Also, whatever happened to the all human council and the citadel becoming something of an oppressive dictatorship? I get that there are technical limitations, but they really should have thought ahead with some of these options.