I don't really agree with most of that*. Plenty of kid and teen stories delve into heavy topics of war and violence (Harry Potter, Avatar, both TLA and LOK, The Hunger Games, Divergent, etc.) And most of them seem to manage to get on fine.
*It is a legitimate difficulty for Animorphs if it is not done in an animated or CGI capacity because their weapon is their ability to become animals, and they are fighting aliens, but if using animation (if it isn't live-action) or CGI (if it is) today there just isn't much of an excuse. But the idea that the content of the stories is what makes it so difficult, especially considering how wildly successful other sci-fi/fantasy war-stories have been, just doesn't carry much weight for me today. Back before Harry Potter, sure, they were afraid of taking those risks for stories aimed at minors, but since then corporations have sort of been making bank on those sorts of stories. I think the bigger problem is that Animorphs, being a 90s series before Harry Potter, had a publishing set-up in that style - short, once-per-month stories meant to go on indefinitely.)
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*It is a legitimate difficulty for Animorphs if it is not done in an animated or CGI capacity because their weapon is their ability to become animals, and they are fighting aliens, but if using animation (if it isn't live-action) or CGI (if it is) today there just isn't much of an excuse. But the idea that the content of the stories is what makes it so difficult, especially considering how wildly successful other sci-fi/fantasy war-stories have been, just doesn't carry much weight for me today. Back before Harry Potter, sure, they were afraid of taking those risks for stories aimed at minors, but since then corporations have sort of been making bank on those sorts of stories. I think the bigger problem is that Animorphs, being a 90s series before Harry Potter, had a publishing set-up in that style - short, once-per-month stories meant to go on indefinitely.)