Even in your link read the standards. Under acceptable is "minor" wear and tear. That's subjective not an objective standard. Tire wear might be more heavily enforced on customers who have other issues that fall into subjective categories because often times its too difficult to enforce subjective standards on people who will argue with you all day long the scratch is minorThere actually are standards for car condition at lease end. Whether they are reasonable or not is a matter of opinion. Here is a link to standards posted by a BMW dealer: https://www.bertsmithbmw.com/lease-end-inspection.htm.
The one that trips people up the most is tire wear. It's no fun to buy new tires for someone else. Also, a dealer's excitement to enforce those standards can be affected by the customer's desire to lease again from the same dealer.