@Thrembs
Ok, but even if it's problematic how is this the author "trying to have it both ways"? Is it the whole "he's not really gay he likes shun so its still BL" that's getting to you? If you got a bone to pick with Mio's characterization why not Shun? Shun's the guy whose internally homophobic with the whole 'In ruining a normal guy' schtick. My point is, neither of these characters reflects the LGBTQ ideal of someone comfortable with themselves and the terminology. That in itself could be a valid critique, and as you say could be the author recycling tropes and its cliche / old fashioned.
I think the crux of the issues with this series is the fact that the author never really 'focuses' on things per se. Their writing and story structure is almost aloof with the fluid passage of time and skipped in-between scenes. For example, what does Mio get up to in those 3 years off the island? We don't get any flashback other than a flashback to when he met Onee and in-text allusions (e.g. he tried to sleep with girls). A result of this is that I feel the story really misses out on being able to flesh out its characters. Mio despite being one of the main characters is quite obscure and as such his reasonings and use of words can be quite cryptic.
He has the whole "he's straight but" line and you point to the whole "he can't get it up with women" and conclude this is a point of criticism but I think this is disingenuous. The line of thinking of "he can't get it up with women, therefore, the line about him being straight is contradictory and the author is trying to have it both ways" is simply a faulty argument.
If we're going to talk about context, then in-text is
as important as that of the context of the work relative to the real world. The whole 'I couldn't get it up with women' line is brought up when Shun and Mio are essentially discussing they're sexual preferences. Mio couldn't get it up with women likely due to emotional hang-ups (feeling pressured, maybe he just didn't like them enough for sexual attraction) while Shun
could get it up despite him being
gay (regardless of if he really was into it).
If you're going to criticize the whole shun not being presented as gay despite not getting it up with women, then you have to also bring up shun being able to get it up with women despite being gay.
The whole point of the conversation is pointing to the fact that different people have different sexual abilities/preferences regardless of their sexuality.
It's the author with their equivalent of a neon sign and most pointed dialogue, explaining, in text, different characters have different levels of sexual attraction, regardless of sexuality. A justification and an explanation within the story's context to the reader as to why Mio 'not getting it up with women' but not identifying as 'gay' is not inherently a contradiction. Shun can get it up but doesn't feel attraction, Mio can't but does.
That's it. If you've read this far, you have my respect and apologizes for being so long-winded.