Since the Professor said he sees this season as being about worldviews more than about politics (which I think are inextricably linked, but that's another thread....)
I think we need to take a higher-level view of the Elves' stories for a moment, and consider their worldview vis-a-vis men. We have postulated that the three houses of the Edain take different views of their relationship with the Eldar; have we considered the reverse? What is the proper role of Elves regarding Men? It seems to me that there are three main points on the continuum from an Elven point of view:
1. The Men are unworthy of attention (see: Celegorm, etc)
2. The Men are our juniors, but worthy of our instruction and support, just as we received instruction from the Valar (see: Felagund??)
3. The Men are our equals as children of Illuvatar (see: Aegnor??)
These worldviews that different Elves bring to this relationship will necessarily manifest in many ways. Politically, you see the range of how men do/don't live among or cooperate with the Eldar in government and war. Economically, might we see a range from casual trading partners, to apprentice/master, to equal partnerships? Personally, might we see a variety of friendships (and unfriendships) based on these different views?
This is where my comment about the political opposition to Andreth & Aegnor's relationship would come in. It's not so much about mundane politics as it is about worldview. Those who took the first approach above would obviously oppose - why would you keep a human pet as a wife? However, those who take the second or third approaches have some thinking to do! It's not enough for me that they say to Aegnor, "Dude, she's mortal and you're not, so it could never work." Because the response could be, "Isn't it our place to provide as much joy to our younger brethren as we can, while we can?" One could argue, "You'll get a short time of joy and a lifetime of painful widowhood." The reply might be, "They're our equals on this Middle-Earth and I'm willing to take that chance with them."
But the argument that would be hardest to refute would be to turn to Andreth's own ideas. SHE is the one who argued that Edain and Eldar shouldn't live closely together, because it strains the nature of each, and led her people on a long march to greater independence. The audience will surely see the irony of her rejecting her own arguments when it comes to her own life. If NONE of the Eldar express this, I think they'll look shallow and foolish for not even noticing the obvious contradiction. It could be Aegnor himself who brings it up in an attempt to refute it, or it could be someone else (preferable someone close, I think), but that extra layer needs to be in there for the story to be truly believable.