But Hinako being gay is central to all of that. She's like, "Oh no I'm not normal and I'm not happy being like most women and I can't fall in love!" and, like... literally all of that is because she's gay. Sure, she could plausibly have self-esteem stuff built up all around that, but the gayness is the root cause.
It's like if I wrote a story where a man is sexually abused as a child, and as a result, when grown-up, he is scared of intimacy. And then I never explicitly bring up the abuse (instead just suggesting it) and justify it by saying, "Oh, this isn't about abuse, it's about fear of intimacy." Except, like, it's not... it's about fear of intimacy from a history of abuse, which is different from other kinds. Or, I write about a kid who doesn't fit in because she's deaf, and no one in the story ever says the word "deaf." Even if it's not the focus of the story, we all know it's relevant; it's weird not to acknowledge it somehow.
What concerns me is, like, making the gayness subtextual instead of something talked about directly has some practical benefit for this story being sold or to readers embracing it. Like, "you can tell your yuri story, but only as long as none of that gay stuff is part of the deal: for all readers know, this coworker is just a weird exception to her straightness."
I have a few concerns with this.
The story is told from Hinako's perspective. Thus far, she's the only individual we've had internal dialogue from. She isn't thinking about how she's gay, because if she were, the entire conflict of her thinking she's not able to fall in love would be over. She's not at that point mentally.
The way I interpret your comment is "Instead of the author telling the story she wanted to tell, she should've told the story I wanted her to tell. But because she didn't, the story is flawed."
Also, I don't think the gayness is subtextual. The story is about as blatant as you can get in showing Hinako's attraction to Satou, considering that she hasn't even realized it herself yet. The only way it could be more obviously repressed-gay is if she were constantly trying to hug or cuddle up to Satou - which, she probably would do if she were a more physically intimate person.