Occam’s razor, also called law of economy or law of parsimony, is a principle stated by the Scholastic philosopher William of Ockham (1285–1347/49) that “plurality should not be posited without necessity.” 

If we expect a member of staff to go into a potentially violent and aggressive situation with the aim of controlling and restraining another human being for the purpose of keeping everyone safe, where heart rates and emotions will be high, you have to give them simple skills. Otherwise we are failing them.