.... It's pretty hard to know solo impacts the galaxy just from that.
No, but that is the starting point (as are all advertisements) - from there, you go to the games website/forums/info pages and read more to decide if you want to buy it.... failure to do so lays firmly on your own head, not the designers.
I seen "Single Player" and "Multiplayer" advertised (I missed the MMO tag myself) - and I though to myself, hmmm are the single and multi saves separate - must go and find out
BEFORE BUYING.
I discovered info on the BGS, the modes, links to KS funding quotes... it was a wealth of information, all because I wanted to know if I was going to have to run 2 saves or not.
And in todays day and age,
EVERYTHING advertised comes with fine print (T&Cs apply, See in store for details, Extra charges may apply, Ask the bill payer for permission, Not actual game footage, Restrictions Apply, Sold as Seen - and so on).
Who do you think is responsible for reading the fine print before money changes hands? ( <- rhetorical question)
So if people want to argue over what is advertised, for a start - the game is sold as single / multi / co-op / mmo (so everything covered) and secondly, it's buyers responsibility to know what they are buying (no information was hidden, it was all there). Failure to uphold your own* responsibilities and due diligence is not my problem, it is not FD's problem and the game should not be changed because someone is lazy and couldn't be bothered to do some basic reading.
[* = "your own" in the general sense of someone buying something, not you personally / specifically]