Like, you can think someone's cute or beautiful or sexy or whatever, but that's not exactly what I'd call a solid basis to seeking a relationship, much less in his specific circumstances.
I think you’re misunderstanding my point just because I called Tsubasa beautiful. In the chapter I referenced, Chapter 13, Hiromi lists a number of things he likes about her. For example, he says he likes the way she defuses serious situations with a joke, and how she graciously offers her ear to whatever might be going on. He also likes how Tsubasa cares for everyone in such a casual, easygoing way, which he finds amazing. He understands that she does not need to act feminine because he already finds her charming as she is. That is the quality he is drawn to, and that is what makes her attractive to him.
Chapter 13 runs parallel to Chapters 49 and 50. In Chapter 49, Tsubasa praises Anju for being direct and admits she wishes she could be more like her. Then we see a backstory about Tsubasa’s high school years, where a classmate teased her for not having a girly vibe. Ever since then, she has struggled to show her feminine side.
But Chapter 13 already revealed that Hiromi does not care about her struggling with femininity, since that is not what he finds attractive about her. Yet in Chapters 49 and 50, she allows that same insecurity to become the reason for her depression. In Chapter 50, for example, she tries to confess her feelings, but because Hiromi did not fully understand her, she took it as an indirect rejection. Instead of clarifying or doubling down on what she meant, she pulled back and assumed he had flat-out rejected her. I cannot say for certain how Hiromi would have responded if she had been clearer, but in that moment she let herself sink into depression over a misunderstanding.
Now, all I said was that she is beautiful. I didn't list off reasons why I think she would be a great love interest for Hiromi, nor did I say that Hiromi has to see Tsubasa as a love interest because she's beautiful. I simply said I do not understand why he wouldn’t. Maybe I could have phrased it differently, but that wasn't what I meant.