I'd argue that people have never been interested in historical accuracy. History has always been used to further 'identity politics', it just happens to have been the identity of white, straight men as a general rule.
Academic, and popular history, is becoming more interested in different stories and more nuanced. Playmobil, which is a childs toy, is making what they believe will sell to children. The two are not particularly related.
The more I think about it, I think you're right. Kids have never cared whether something is historically accurate. They just want something fun that will spark their imagination. When I was a kid, I really loved the Lego Dragon Knights. They were only loosely based on reality.
I think what really bothers me about the way toys and media are changing is that it seems like companies are having to make things extra flashy to catch people's attention. They have to compete with all the clickbait online, and kids who grew up with the iPhone pacifier aren't going to look at something that's as simple as what we grew up with in the 90s and earlier. It has to be have lots of bright colors and make kids go WOW! Whereas when I was a kid, I'd look at the sets in the magazines and imagine stories, even without actually owning the sets. They weren't super flashy, and they didn't need to be. They were just generic characters, and my imagination filled in the rest.
These days, kids expect the media and toy companies to fill in all of the details of the stories. They're so used to consuming media, they don't want to put in the effort to imagine something of their own. To me, that's really sad.