Guidance has to be written to be understood by all cohorts, not just defensive MC mums on forums who occasionally pop on the Gruffalo in-between baby yoga and drama.
It's important to share the research because people (in spite of what's said on MN) are still heavily affected by the norms of their class and culture, and in economically deprived households, expectations and therefore outcomes are so much lower. Because if every kid around you watches 5h, you can feel like you're doing better if it's only 3.5h.
My son watches the odd hour of TV (unlimited when unwell). We steer clear when it's something that addicts and zombifies him, but, for example, he watched Tabby McTat to decompress, and afterwards pretended to play his toy guitar and sang the song.
Nobody is saying that sort of interaction with TV is harmful.