"Discworld" series- while it touched progressive topics in the past- about race, religion, women empowerment, society, acceptance of others etc, but it was done in a balanced, and most importantly, funny way. Like when police captain who admits he is racist towards trolls and dwarves, but it's because he has to deal with their shitty ways on daily basis, and is iritated when people who have never met a troll spout racist shit, because their racism is not justified and comes from bigotry. Or a story about a dwarf female coming out as female, because in dwarven society all folks are male presenting (females too have beards), and being openly female is seen as degenerate. Or how you should not believe in racial stereotypes, like that dwarves are very greedy, coincidentally the most famous dwarven folk song, "Gold" has lyrics that is just the word "gold" repeated over and over
But in later books it seems theres way less humor around those issues, and more hamfisted attmepts to let you know that "SLAVERY IS BAD! DO YOU UNDERSTAND?? BAD!!!!!!"- there's new sentient race introduced, goblins, that apparently everyone is totes ok to enslave and kill with no remorse, and noone cares, except for the protagonist of course, and he fights slavers and frees the slaves, the end. Oh and some of them gblins are super talented and one of them gave concert in opera and everybody clapped. It's just fucking terrible.