As your baby grows, they become curious and want to observe the world around them. Carrying them on your back allows them to satisfy their curiosity while still being able to feel secure with you.
With a heavier child, you'll also experience more comfort with better weight distribution on your back, just like a backpack! Back carrying also gives you better mobility with your arms, giving you freedom!
And for hiking with your child, it's so much more practical to see where you're stepping, right?