Throw to Win
Throwing one's opponent to the ground as a sign of his defeat is something we know from knight tournaments in medieval Europe. There, the opponents attempted to knock each other off their horses with long lances. In one of Japan's oldest martial arts, sumo, the opponent is supposed to be thrown out of the ring.
In this video from 2024 (Kobudo; Shibukawa Ichiryū Jūjutsu), we see how throwing is first used to ward off the attack and then to control the opponent on the ground as quickly as possible. Controlling the attacker without throwing him is possible if he can be brought to the ground by his arms.
The alternative to throwing in modern budo disciplines (gendai budo) are kicks or strikes, as in karate, or the famous atemi in aikido, which can, of course, also result in the attacker falling to the ground. In judo as a competitive sport, throws are the method of choice. Aikido inherited throwing from Daitoryu Aikijujutsu.