Steiner is weighing up his options for next season to whether to keep Schumacher at the team alongside Kevin Magnussen or replace the German.
Earlier on in 2022 doubts arose over Schumacher's future at the team - and in F1 at large - due to several crashes and a lack of results, but after the summer break the 23-year-old has managed to steady ship.
While Haas has generally struggled for competitiveness, Schumacher outqualified Magnussen three times in the past five races and looks to have kept himself in contention for 2023.
When asked if Schumacher's history and experience with the team could be an additional argument in favour of the German, Steiner admitted that 'the incumbent has a home advantage.'
"Absolutely, if you are working with somebody for two years, that’s an advantage. The incumbent has always got the advantage, it’s a home advantage," Steiner said in Japan.
"If you can have somebody you work with for two years, it’s better than bringing somebody new in, because as I always said you don’t have the learning time.
"That’s why we brought Kevin back as well, because he was here. He was out a year, but he knew everybody, and that’s always an advantage when you start from somewhere."
After a disastrous Monaco Grand Prix in May, in which Schumacher suffered the latest of several accidents, he came under fire as the team's bills for crash damage piled up, with Steiner saying: "it's just not possible to continue like this."
In Suzuka Steiner said he was happy with how Schumacher responded and found a better balance between risk and reward.
"I cannot say no, because he didn’t do any damage to the car or anything, and he scored points," Steiner added, pointing out that Schumacher had managed to develop his craft.
"That comes when you score points, because if you are not understanding and develop as a driver, you do not score points."
If Haas decides not to continue with Schumacher for a third season, the vastly experienced Nico Hulkenberg is still considered to be a contender for an F1 return.
Antonio Giovinazzi, who will have a second FP1 run with the team at the upcoming United States Grand Prix as a favour to Ferrari, is also said to be on the list.
Meanwhile Pietro Fittipaldi, who deputised for the injured Romain Grosjean at 2020's last two races, has been confirmed as the team's FP1 driver for Mexico and Abu Dhabi as part of its two mandatory rookie runs.
