This is actually the case. There are plenty of actual films in existence with gay characters who are major parts of the actual plot or are protagonists of films. There have been strong gay films for decades. The 1990s had quite a few of of these.
Disney 30 years later including a man holding a man's hand for half a second in the live action Beauty and the Beast or two girls kissing in Star Wars, doesn't do anything to advance the cause. It's like boasting about doing the bare minimum to pretend you care.
There's nothing ground breaking or even committed about these "moments" that are quickly inserted into a shot for the twitter reaction.
Both these scenes are not in most international releases of these films by the way.
In 1997 Disney had a major star of their sitcom come out as gay on air. That's some actual commitment. What they do now is throwing some scraps to the LGBTQ folks.