It doesn't work like that. Oda places heavy emphasis on fighting styles in One Piece. Someone like Garp, who is the pinnacle of physical strength in the series wouldn't be able to pick up a Sword and cut Pica's Golem in half. Why? Because as far as we know, he is not trained to do so.
Can Zoro throw a strong punch due to his physical strength? Of course. But can he throw as punch as powerful as someone with the same level of physical strength, who trains and fights as a brawler? No. Throwing a punch is much more than just being able to swing your arm really hard. That's why boxers train rigorously day in and day out for years to get to the level where their at. Not just any dude with raw physical strength can hop into a boxing ring and hope to stand a chance against someone who is trained. Technique and form matter, even when it comes to brawling.