Actually, IndyCar doesn't need or want power steering due to the hysteresis involved with power steering's feedback-robbing complexity.
By shifting out of the Friction Paradigm into the Leverage Paradigm at the HMI (Human Machine Interface), drivers can move more into their propriceptive sweetspot where the top of the mu-slip curve seems to light up in their minds.
EMG tests showed the force required to turn the wheel is 54% less when the drivers are PROPERLY molded to their steering wheels. As such, power steering is not needed.
When I made Michael Schumacher's steering wheel, Ser #159-F1001, he won the F1 Championship without power steering, no problem. When I made Fernando's 2 steering wheels (Ser.#s 414/415) a couple years ago, my designs were much improved.
However, as F1 remains the most technologically advanced racing organization on the planet, suggesting the removal of an "advanced technology" for what seems to be very primitive alternative...well, it ain't gonna happen, folks...especially since it was invented OUTSIDE of F1's hallowed walls by a "bloody American"!
I'm sure they've seen my work, and a few have tried it only to discover that the way THEY did it, it doesn't work.
As I explained at steering conferences in Berlin, Dusseldorf, and Ann Arbor, Michigan, it's not as easy as it looks.
BONUS: removing a complicated power steering system also removes many potential points of failure; nevermind the drivers feeling the cornering limit with far greater resolution. BUT, that means they'd need to go to the gym more, too!
A pair of composite thermoplastic grips probably weigh a little less than an entire power steering system...I'm guessing.
Nothing beats the feel of a PURE prismatic pair coupling the INSIDE surface of a driver's glove (due to compression) with the molecules of rubber touching the ground using leverage...NOTHING.