You should read some modern psychology book because this reasoning is false, especially for an infant. In French there's an amazing book by Catherine Gueguen, "pour une enfance heureuse" (For a happy childhood), it builds on the latest researches to offer guidelines. Its scientific take helped me overcome such unfounded traditional thinking as the one expressed. Sadly, I couldn' t find it in English, but there will be others.

It's completely premature preparation and many believe leads actually a much less independent person later, and on the extreme someone with severe anxieties. Imagine asking a toddler to cross the street by themself, do you just risk them getting hit by a car just so they know not to? No, more sensibly you'd be there with them to guide them until they're truly ready to do it alone.