Stranger Things does a great job at keeping viewers engaged. The Mind Flayer was revealed as a villain and seasons later its origins were explained. Joyce Byers and James "Jim" Hopper finally kissed in Season 4. They could have gone further but that darn phone!
With the final season in sight, it's extremely likely that Will Byers' sexuality will be addressed. Over the course of four seasons it's been made clear he's gay. So it's safe to assume he'll be coming out of the closet in the final season.