Kitty vs Siverfale

Well... Intelligence helped humans survive. But they definitely couldn't have done without strength. It helped them survive the Ice Age.

No, that's the point – many creatures didn't survive, and the most adaptable ones did. That's why some learned to hibernate, some grew long fur, and some took refuge in caves, covered them with hides, and made fires.

Moreover, ancient humans were much stronger than modern ones – strength was needed to provide for themselves. So, you could say that if ancient humans were weak, there wouldn't be a story – in the beginning, strength was more important for survival.

But humans were significantly weaker than most of their "contemporaries," so strength was far from being the dominant factor in survival. And the weakening of humans once again proves that strength is no longer a more or less important factor for survival.

What is strength? It's not just the ability to defend yourself from bad guys at night in a dark alley, it's also health and endurance, a good physique, after all. And health is very important today.

With intelligence, you can earn enough money to buy a non-lethal weapon (and, more importantly, figure out how to do it :D), which, as you know, has only one drawback – when shooting at the torso, you can be charged with "exceeding self-defense" (or something like that, I don't remember the exact name, but the point is), which is a good indicator of its effectiveness. Besides, if there are more than 3 enemies (and enemies, aka thugs, don't go around in smaller groups), strength won't guarantee victory. And a non-lethal pistol (which, by the way, was created thanks to the same intelligence) not only demoralizes the enemy but also works wonders if you know how to shoot. But we're not arguing about the effectiveness of weapons here. :)
Now about health and endurance. For health, it's enough to eat properly and do yoga or exercise in the morning (there's nothing supernatural or exhausting about it, anyone can do it).
And as for endurance, mental stability is much more important now, because life is bustling, that is, "mental endurance" is important.
There you go. :)