> You dont need deeper understanding of knowledge for everything. Ask Grandma whether she needs a chemical engineering degree to bake apple pie.

You've clearly never baked before. Baking is a chemical science. You have to adjust temperatures for your freaking elevation relative to sea level. Granted some recipes are pretty forgiving, sure, but far from all, and some are downright merciless in terms of complexity and effort required.

Even people who do it constantly have items that just don't turn out because it's legitimately hard shit.