I don't know if I have anything quite as striking. I have moved away from fantasy taste-wise, but that's more because all the battle shonen manga I read is fantasy, so for literature, I want something a smidge more grounded in real life, just with an actual story.

I did eventually read more romance, but it was far after my previous relationship, and I liked romance stories even during and before that, so there wasn't any shift. I guess the main one is children's novels - I tried rereading some as an adult, and I can't enjoy them as much anymore. Understandable of course.

I would probably be in a similar boat with others avoiding darker/gloomier stuff..but I've actually always been like that. So I suppose my tastes are mostly the same, just shifted a bit to older things over time.