no, you can tell the broad parameters of a personality by a person’s handwriting.
the best application of graphology I have ever heard of was my cousin wrote to Ben Gurion in the 1960’s when she was first visitig Israel. She told him she was a graphologist (she was, as an act i the Catskills) and offered to do a reading for the retired prime minister.
He invited her to his cottage on Sde Boker and she got to meet the great man himself, all in exchange for a graphological analysis.