Dream Daddy is a game where every single datable character is male, with you the player being also male in-game, it’s a good game, but for some, being put in such shoes may not be a good experience, and others may enjoy it.
On the other hand, some of the infamous Sakura games, feature only females as their characters, so given their nature, your in for some lesbian based relationships as well, which for some reason is a bonus for some players
Like these, there’s a plethora of VNs that feature same-sex relationships, it may not be a relevant tag for a game like Borderlands, but it is quite relevant in the realm of visual novels, where the story is paramount, so it’s helpful for people to know what the game is about from the beginning,
not to mention as @yitzilitt said, to make it easier to find such things.
That aside, the problem I see with “walking sim”, is that people started using it in a derogatory manner, so even if the game was good and an actual game like Gone Home(which is relevant to the topic by the way), people would avoid it without a chance just because of the tag and its association with game-play, unlike LGBTQ+ which basically denotes a theme or type of content.
@yitzilitt Congratz on your flu pal. Adding to what @Fraggles said, those news are more about the tag rather than your game, so maybe that can also affect results?