Basing a fantasy culture off of a real-life culture. Or even worse, basing a fantasy race off of a real-life culture - that's just dehumanization. It's very common, it's very problematic, and it's a remnant of racist 20th century fantasy. The Forgotten Realms has to be destroyed, sorry. Genshin Impact as well.
If you're going to be using a real-life culture, you need to seriously know your stuff and have respect for the culture you're writing about (this is why Liyue is good and Sumeru is racist trash, for instance). I'd say to most people that if you want to use someone else's culture cause it's cool, consider worldbuilding something unique instead and save us all a headache.