I think the phrasing is a little extreme. Rather than “tell them what to eat” I’d say something like “everyone wishes they had a personal assistant”.

I could do a lot better at meal planning than I do. I rotate between relatively few dishes. An AI that finds recipes and automatically adds the ingredients to my shopping could be interesting. Technically it’s “telling me what to eat” but it’s not like I’m taking orders from it.

>My elderly parents would absolutely love if someone would just tell them what to do and eat every day

I guess a lot of the AI enthusiasts are already pushing the "I automated my daily life decisions to this awesome AI. I now have more time and more brain power left to be productive!" angle.