Planets are round, naturally formed bodies orbiting a star. (I know no planet is perfectly round and you can call any defined tolerance “contrived”, but at that point there are no useful and universally fitting definitions for anything in nature. Definitions are always categorizations by human standards)
Many asteroids are round. The list of planets, under your definition, would be so large it isn’t useful anymore. Even when Ceres, Pluto, and Eris were called planets the list was getting too long, and there are several larger than Ceres. Including every nominally round object would be insane.
Planets are round, naturally formed bodies orbiting a star. (I know no planet is perfectly round and you can call any defined tolerance “contrived”, but at that point there are no useful and universally fitting definitions for anything in nature. Definitions are always categorizations by human standards)
Many asteroids are round. The list of planets, under your definition, would be so large it isn’t useful anymore. Even when Ceres, Pluto, and Eris were called planets the list was getting too long, and there are several larger than Ceres. Including every nominally round object would be insane.