Cricket great Justin Langer says Australia risks promoting "diluted messages" if they decide to appoint specialist coaches for each format.
And he hopes the push to play Big Bash League cricket on Christmas day falls flat.
Langer will attempt to overturn Australia's faltering Twenty20 fortunes when he takes the reins of the national side for their three-match series against Sri Lanka in February.
The former Test opener was appointed caretaker coach for the T20 series while incumbent Darren Lehmann is in India preparing for a four-Test series.
The scheduling overlap is a rarity in international cricket, and Langer jumped at the chance to fill the T20 coaching void while Lehmann prepares the Test team.
But the 46-year-old hopes it will never reach a point where Australia appoint different full-time coaches for the Test and one-day formats.
"I think it's still really important to have one person overseeing the whole thing," Langer said on Friday.
"In a perfect world, you have one captain and one coach overseeing it all.
"But in times like this (where there's a schedule conflict) you can have good people to help out when required. But I honestly don't think that's the way forward (on a permanent basis).
"It can become diluted messages sometimes."
Langer said his ability to coach both Western Australia and the Perth Scorchers was the perfect example of how stability over the different formats could translate into success.
The Scorchers have won two BBL titles and never missed the finals under Langer's watch.
They also won a one-day title, and reached two Sheffield Shield finals.
"One of our advantages at the Scorchers is we've been able to have that continuity of one coach and the same coaches right throughout the system," Langer said.
"Our record at the Scorchers shows if you keep that continuity throughout the program, you get the benefit.
"My view is that's the way it should stay."
Langer was given the caretaker role over the likes of Mike Hussey, Shane Warne, Jason Gillespie and Ricky Ponting.
The temporary appointment confirms his status as Lehmann's most likely successor, with Langer also standing in to guide the national team to a one-day tri-series win in the Caribbean in June.
Langer isn't sure what his coaching support cast will look like for the three-match series against Sri Lanka.
But he doesn't want to go overboard.
"Hopefully we can trim it down a bit," Langer said.
The BBL is considering scheduling a match on Christmas day in the coming years.
But Langer isn't a fan of the idea.
"I hope it doesn't happen," Langer said.
"Christmas Day is a really sacred day. I would not like to see sport played on Christmas Day.
"It's a great time for the families. We've got to respect the players, coaches and administrators."
