I mean, it's the general "dark medieval fantasy is good because [edgy stuff]". People do it with FE4 as they do with other stuff such as Berserk and Game of Thrones. It's almost impossible to be in the FE fandom without hearing about the torture/rape stuff in FE4 before even playing it as a lot of people think just having "dark stuff" means the story is serious and mature, therefore good.
This isn't a diss at these stories, but more on why I don't trust people's judgement when they lean too hard into worshipping these things, yet focus almost only on "it's dark/mature".