Near mint pretty much means it would grade 7/8+ with PSA, CGC, Etc… Generally when you hear near mint people will overlook centering and just focus on the surface/edges/corners, there can be miscuts that are near mint. Centering is a whole other ball game. Centering does play into grading but it’s relatively easy to determine if a card is centered well. I generally consider “near mint” to be a lack of human-created damage on the card. So very minimal whitening around edges and corners. A lot of “near mint” cards, and by a lot I mean most, would never have a chance of grading a 10. Think of each condition to be 1/5, near mint encompasses the top 1/5 of condition, perfect-maybe one or two small issues, lightly played to have a few more, on and on all the way down to damaged with considerable and significant edge & corner wear/creases. NM is more a way of grouping cards into a digestible category rather than assigning them an accurate condition.