because Romantic love is giving someone else yourself in Totality, and your Significant other doing the same.
That it Impossible in Qunari Culture since their Modus operandi is total devotion to the State.
Are two people who are in love incapable of also loving their parents, children, siblings, and friends? Are they unable to be driven at work? Are they incapable of passionately devoting themselves to anything other than each other? Of course not. People are more complicated than that. Nobody gives themselves 100% to anything 100% of the time, not even the person who they are in love with.
It is not impossible to be in love with somebody even if you cannot have sex with them. It is not impossible to be in love with somebody even if all you will ever be able to do with them is work side-by-side every day.
I don't think that was ever in question. The debate is more "is homosexuality allowed in the Qun?" And I think the answer to that is "LOL nope."
We really don't know that, though. I find the assumption that a highly structured society would automatically be averse to things that OUR culture is traditionally averse to a huge fallacy. People also assumed that the Chantry would frown on the very same thing. It generally doesn't care.