If you ran for a few meters and tried to control a ball at your feet, you'd understand somewhat. Even that is extremely difficult to do well- shifting the ball and keeping it under control of your feet and away from defenders.
Now try to imagine people trying to hack you down (totally normal defending back then) and tugging your shirt, in the blazing heat, at altitude, against a team that humiliated your country in a war a few years earlier...and instead you waltz around all of them, make them look amateurish, and knock them out of the biggest sports tournament on the planet at a sport they invented.
Nicely put me old fruit. Sadly we have managed to make a habit of that. For example the "death of English cricket" - https://www.bbc.co.uk/newsround/23241494 is why the Ashes exist.
Soccer is not grid iron, nor is it rugby but back in the day, defence could be quite a bit more robust than it is now. Footie players are not built like the second row and if you happen to apply six studs (cleats I think for the left pondians) at speed to the side of someone's knee then it will not end well.
If you look carefully, you will notice that Maradona doesn't simply whizz around defenders: he completely humiliates our boys by finding space and making the ball go there with him. The bloody thing is attached to his toe when he needs it to be so and then he simply flicks it into the net, almost as an afterthought. He barely looks at it - he know where it is because he has told it to be there.
Now try to imagine people trying to hack you down (totally normal defending back then) and tugging your shirt, in the blazing heat, at altitude, against a team that humiliated your country in a war a few years earlier...and instead you waltz around all of them, make them look amateurish, and knock them out of the biggest sports tournament on the planet at a sport they invented.