What's the most fun day you had in Sims 4.

I don't think anyone programmed parents to ignore toddlers' cries or take their food. They did program thunderstorms to be optional, so if they cause stressful situations for you, you may consider turning them off. Or giving parents the Carefree trait so they don't automatically freak out and run indoors. Also, thinking a kid is following and suddenly realizing they're not does unfortunately does happen to parents in the real world. In real life, parents notice within a few seconds and react, but the Sims aren't programmed to always keep their toddlers in sight. Nor should they be, in my opinion. The toddler stage is supposed to roughly represent ages 18 months to 6 years. A preschooler does not need eyes on them every second. Plus, the Sims removes certain real world dangers. Sim toddlers live in a world where they will never get kidnapped or hit by a car or attacked by a dog. Ergo, adult Sims have no issue with them wandering outside by the road. All the toddlers automatically stay near enough to home and can't interact with anything potentially harmful. Until Seasons was released, there wasn't even anything outside that could really bother them.

If you think the parents should be programmed to be more watchful of their kids in bad weather or that there should be an option for "cook a meal for toddler" that prevents any other Sim from taking the food, you should absolutely suggest it. But in the meantime, you can also just make bigger meal portions or store food in the toddler's inventory. Harvestables like strawberries and bananas don't go bad and make a great toddler snack when they're waiting for a meal.

Hope this helps!