ISTPs' "stupidity"

"Honorable Mention: ISTP ("The Virtuoso") can also sometimes exhibit "himbo" traits, particularly when they are very hands-on and practical but not particularly interested in deep theoretical thinking. ISTPs may be action-oriented and physically adept, but more quiet and less socially animated than the typical himbo stereotype."

fictional ISTPs (according to PDb at the time of writing): Kaseki (Dr.Stone), Kohaku (Dr.Stone), Roronoa Zoro (One Piece), Seiko Ayase (Dandadan)