I do genuinely have a phobia of bees, but only the real life ones. Seeing a bee on a screen doesn't actually spook me, unless it's a photo or a video of a real one. Hell, one of my favourite plasmids in "Bioshock" is the one that turns your hand into a beehive. But I bet there are people with a more severe version of the same phobia that are disturbed even by cartoony bees and therefore would be discouraged to play a game they would otherwise enjoy.
Bee Queen's loot, sweet as it may be, is completely optional. You can play the game and enjoy it just fine without ever fighting her. Lunar Islands are optional as well. You decide whether to engage with them.
But where do we stop? There are hundreds of thousands DST players, each one of them has their own fears and hang-ups. What if a portion of them is extremely arachnophobic but still want to experience every single spider-related piece of content? What about people with fear of caves? Or sea creatures, deep water and drowning? Should we just add some sort of Pyrovision-style filter that would allow even people with the most delicate constitution to experience the game fully? And adding a filter only to Horror Hounds and Moonrock Pengulls would inevitably raise questions, like why only they get a special treatment, why other scary mobs are left as they are?
Besides, the thing is, not everything is going to be 100% made for everyone. I am easily startled and I feel uneasy playing with strangers (I almost always play DST alone), therefore I generally stay away from horror and multiplayer-only games. Sure, this means I miss tons of great games, but that's life.
To me this doesn't seem like a correct term to refer to the features people suggest. To me accessibility feature is something that gives players ability to experience the game, as the devs intended it, despite their physical limitations or language barrier. Toning down spooky elements, while technically opening the game to the wider audience, betrays its core design. The "Don't Starve" series has always had a dark undercurrent to it, neutering it would be like removing portals from "Portal" because some people get motion sickness easily.