When it comes to aliens or monsters, I must admit to being more “Battletech” (no aliens save for one weird diversion) and less “Star Wars”. It’s just a matter of personal taste, I’ve enjoyed many stories that feature aliens and/or monsters, and I don’t hold anything against settings that do feature them. But it’s a taste I’ve found surprisingly consistent over time, and most of my plans for writing , as opposed to just reading, don’t feature sentient nonhumans.
Some of it is my preferred genres that don’t tend to diverge into science fiction or fantasy. Some of it is a dislike of “rubber forehead aliens” (I like Stephen Baxter because his aliens are truly alien). But some of it is a sad commentary on human nature. I can sum it up as “Why would I need monsters? Humans can be monstrous enough already.”