That assumes their are only 2 stars involved. Add a 3rd or more and things get unstable.
“We ran a series of statistical models to see if we could account for the relative populations of young single stars and binaries of all separations in the Perseus molecular cloud," Stahler said. "And the only model that could reproduce the data was one in which all stars form initially as wide binaries. These systems then either shrink or break apart within a million years." https://www.space.com/37186-sun-long-lost-twin-nemesis.html
“We ran a series of statistical models to see if we could account for the relative populations of young single stars and binaries of all separations in the Perseus molecular cloud," Stahler said. "And the only model that could reproduce the data was one in which all stars form initially as wide binaries. These systems then either shrink or break apart within a million years." https://www.space.com/37186-sun-long-lost-twin-nemesis.html