To me it seems like we have this paradoxical situation where the media want to simultaneously present inclusivity and diversity, but don't dare present any of the real diversity for fear of stereotyping. The end result is some token LGBTQ+ characters who are heteronormative, which is disingenuous.
If it is a choice between no gay character and some gay character who is essentially 'straight acting', I'd choose the former every time.
I often see (edit: readers) mention that a story has gay/straight characters, even when (to me) there is no opening in the plot for characters to express their romantic inclinations. What exactly are you looking at when you perceive a character as $orientation?
"E.T.: The Extraterrestrial" is a classic coming-of-age story of a gay man in the modern world.
Dracula by Bram Stoker is the quintessential gay liberation epic.