Hi.
rewired might work on the old control system but it uses it for its own purposes.
I just checked the asset and the latest update was January 2022.
So it is still supported.
If you look to the reviews, look for the 3 start review from 'fokozuynen'
the publisher has replied and explained there that Rewired is primarily a native input system.
To start with it you might find it a bit intimidating, but it's very worth while to use rewired.
The main reason I went for the new input system was that I could get racing wheel and pedal controls to work properly with UnityCar,
with the old input system in Unity pedal movement only registered from halfway down, since you couldn´t normalize their inputs.
With this new system I can do that myself, I don´t know if I have use for Rewired since I can do it with this too.
I believe Rewired has the same problem, my friend couldn´t fix the pedal issue with it.