robably even lower than that considering they dont know anything about existing information
Sidenote: intelligent and educated\erudite are two different things. I won't call MC stupid but, I would agree that they are uneducated (which IS kinda irritating to me since I always RP some kind of either bard or wizard) Ig always making MC non-erudite is a lazy plot device to have you learn the lore without reading 983475 entries in the codex; kind of a brother to many games and books making MC amnesiac so that the reader would learn the world along with them).
Realistically, your MC gets an incentive to study different countries and their political systems only with one of the three mentors (remember, we are in fantasy-esque middle ages or smth, so I assume not everyone in this world can even read; MC being able to read and write is, probably, already a sign of being educated). And even if your MC is Brissa's mentee, it is made clear that she secretly held MC at arm's length because her first pick was Aeran and MC was an extra. She'd have to teach MC things and take MC with her, but she did a stty job at it. Otherwise, it depends on whether MC travelled there or not, and they didn't. If it were up to me, I'd have at least Brissa's mentorship make MC politically savvy instead of coming up with the reasons why a woman who should've taught them a lot about history and politics did a half-assed job at teaching.
they cant hold a verbal battle
You can also get an upper hand in the gala convos, bait Nova into telling you things, bait\persuade that one senator into it, and get an upper hand over mage council when you are persuading them to let you into the tower. Idk about the servant because I was never rude\threatening to them to begin with (why antagonise someone in an already hostile environment who's in charge of your necessities? She also will be rude to you no matter what because she knows you are dependent on her employer; in pecking order MC and Aeran are, technically, lower than her), so I won't argue about the response MC gives.
If MC is supposed to idolize Aeran, they why do we even get a choice to choose their relationship?
It does affect how Aeran behaves in arguments and conflict. E.g. if MC is in a situationship with him, he at least tries to be less of an ahole, and if MC is in full-blown romance with him, he doesn't try to shut them down in the tower at all. In fact, you get a very different conversation. But you can only romance him properly if MC almost dies and Aeran is forced to reconsider that MC is not a permanent fixture in his life, so there's that. He also discloses more if MC is romancing him, but ultimately the ch 3 outcome with him is still the same.
I also think that MC doesn't even realise they sort of idolise him or envy him (if you have bad relationship). He's just the last part of their surviving identity: I don't like that it's unchangeable, but it's pretty clear that even if your MC didn't like being in the Order, they effing centred their whole identity around it (unlike MC's narrative foil aka Aeran who tried to break away from it). It's also pretty clear that before things fell apart, MC was pretty content being an ordinary soldier and didn't have any ambition to be a leader — and that mindset is kind of hard to shrug off, especially if you can fall back on someone familiar. I don't think it makes them a doormat or spineless, necessarily, but you are right that before the events of the game the only thing truly special around them was their birth circumstances. I am not an author, but reading the IF I kinda assumed that now with Aeran out of the way MC will have no excuses to try and fall back into that soldier role and will be forced to outgrow being a tool they were, quite frankly, raised to be.