Being a parent is a constant strategizing battle. When the kids are babies, you baby proof so they don't get hurt. Gates on doors, latches on cabinets, soft rubber on corners, small and dangerous things move to top shelves. I clearly remember being scared for their lives when they first learned to climb up onto the couches. I was certain they'd fall. They didn't.
As they grow, they can do more without hurting themselves. Climbing stairs is now sport, clambering on couches isn't even fun for them anymore. It's just what they do. Their old Bumbo seats? They make excellent stepping stools to reach unattainable items that had previously been safe from searching baby hands. Every time I adjust my baby proofing to keep them safe, they adjust their tactics to get themselves into potentially dangerous situations. I adjust, they adjust, and on and on. As they become more dexterous and nimble, I am able to loosen certain restrictions, only to have to make new rules for complications that I hadn't thought of when first granting permission.
Yes, you can now climb the stairs. Isn't it great? No! You cannot jump down the stairs two at a time. No! You cannot slide down face first. Yes, you can now sleep on a big bed and not in a crib. No! You can't jump on the bed or bang on the now-accessible windows. Yes, you can now drink from a regular glass. No! You can't do it in the living room. You can't hold it with just two fingers.