'benefit us all' is correct and usable in written English.
You could use it in the context of a speech or essay, for example: "We should strive for policies that benefit us all."
Thanks to Israeli innovators, we expect to see many more use cases for drones that can benefit us all.
In Rand's world, those with talent who are allowed to use it freely, unencumbered by regulation and bureaucracy, will benefit us all.
A well-functioning digital currency exchange will benefit us all because of its low cost and ease of use.
Strategic napping in the Rangers style could benefit us all.
How one industry's growth can benefit us all".
None of these plans truly preserve and benefit us all".
That could benefit us all at the end".
By making the program more sensible the money could benefit us all.
"This newfound attention to the problem can only benefit us all".
A shift toward more vegetarian options would indeed benefit us all.
But the money could go towards homeless people and building businesses that benefit us all," she says.
