I agree with you on your points in response to the other guy, but if we look at this from a practical and more meta point of view:
What exactly would the point of making a romcom, where one of the main characters is incapable of romance, be? Like sure, you could do that, but why would you? That's like the worst of both worlds, imo.
We don't get any thoughtful examination of the aromantic individual and beyond that, it would be frustrating because they never get any peace or are allowed to just exist in the way they'd like to as a result of the other party; then on the other hand, the romantically interested individual is incapable of making any romantic progress, and as a result of falling in love with someone who literally cannot reciprocate, finds themselves doomed to heartbreak.
Idk about you, but both of those outcomes seem super ass to me.
Maybe in a more overtly serious manga, a more nuanced manga, it could work, but the tone of this so far would clash extremely hard with the lategame "yeah Rihito just can't fall in love at all actually" reveal