No it does not. It's called "character building" and is a regular thing among all sorts of media. Not all character building does or has to revolve around advancing a plot but exists along side it. The comics focus on Ana's journey to Hellas Basin and part of that is also a relationship that is happening at the same time.
Don't read the comics if you don't like it so much. It has fvck all to do with the actual game.
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So i can have a character just be gay and nothing more to add as character building.