alt Hacker NewsWorth noting that the attack on the Bismarck was by biplane Gloucester gladiators which were outdated even at the start of the war.
Compare them to the planes that carried out attacks in the Pacific theatre. The Grumman Avenger was maybe 2 generations newer (and actually remained in service until the 1960s(
The Bismark was hit by 2 torpedoes from Faery Swordfish torpedo bombers (not Gloucester Gladiators).
While the Swordfish looked rather outdated, they were very successful as torpedo bombers.