The Boks only regrouped on Monday after spending a month apart, leaving them with limited time to prepare for the November Tests. They also travelled without several key players who are sidelined through injury.
Erasmus says the team's familiarity with one another has been a major factor in their ability to deliver strong performances.
"We've been together for eight years now, but since then we have brought in the likes of Ethan Hooker and Sacha, and many more. The nice thing is that we can put up a team that knows exactly how we want to play in a game like this one. I know it wasn't perfect and we have to play much better than this if we want to compete against Ireland and France."
Erasmus was equally encouraged by South Africa's discipline, with the visitors managing their penalty count well and avoiding any yellow or red cards. He says the coaching staff have placed considerable emphasis on ensuring that the players understand and operate within the laws of the game.
The Springboks produced a dominant display at the Allianz Stadium, scoring six tries before half-time to establish a commanding 45-0 lead. They continued their scoring spree after the break, crossing the try line another three times to complete a nine-try performance. While Erasmus was pleased with the overall execution, he insists that the result should not disguise areas that still require attention ahead of tougher assignments against France and Ireland.
"We made some changes in the second half to see one or two things because we anticipated Italy to come out and play in the second half after we scored 45 points in the first half. I can't fault the guys for their second half performance, it wasn't perfect but it was proper."
South Africa and Italy are also scheduled to meet in the pool stages of the 2027 Rugby World Cup in Australia, with their opening encounter set for the 3rd of October at Adelaide Oval.
The Springboks now turn their attention to France, whom they face at the Stade de France in Paris on Friday, the 13th of November, before travelling to Dublin for their encounter with Ireland on the 21st.