This is what nature documentaries should be—gorgeous, educational, and genuinely captivating. The macro cinematography is so good it makes you see the world differently, and that's worth a lot.
The 'watch for' is really just the reality of nature: things eat other things. It's not gratuitous, but it's there, presented as fact rather than drama. If your kid cries when the gazelle gets caught on Planet Earth, prep them a bit.
The real win here is that it's modern enough to hold kids' attention (2020 production values are no joke) while being substantive enough to actually teach them something. It's not brain rot, it's not boring, and it might actually get them excited about the natural world. That's a rare trifecta.