I have kind of wondered something similar. I was someone who was following a structured weight lifting routine. I made progress each time and I was gaining strength, but I think the weights did get too heavy for my true abilities. I was always teetering at the edge of my maximum capability and eventually hurt myself. This doesn't seem natural or healthy.
In real life we'd just be working hard. Our work would be manageable. It would build us strong, lean bodies. I'm thinking about like if you lived on a farm all the work you might do. Or if you were a primitive person hunting and gathering. You'd always cut the work into manageable pieces, but to get more done you'd try to cut the work into the optimum sized pieces.
Reminds me of the trail work I sometimes do. It's way easier for me to cut the biggest branches I can and toss bigger branches over the side of the trail than smaller ones that require more cuts and more bending, stooping and tossing. I try to build strength but it's always manageable, not teetering at the edge of my capabilities. Always enough I can put in a few hours of it. Always with the aim of getting more done in less time and effort. But never with the goal of cutting down a huge tree and trying to throw that over the trail. In fact, if I did cut a huge tree I'd use an appropriate tool (cross-cut saw) and the tree would be cut in such a way as to fall over the side of the trail by its own momentum. This is why I think trying to get so strong you could toss a whole tree is not really necessary for a healthy, fit body.
Female, 5'3", 50, Max squat: 202.5lbs. Max deadlift: 225 x 3.