I'll just say that you can't tell how on edge a driver is by steering input.

the car movement, possibly.
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steering input - accelerator control
(how he's correcting the steering managing traction & working towards full throttle through corners )
I think we have to bear in mind that these are top highly practiced drivers in a highly competitive environment
as a result the car movement would seem smooth and steady
-even though they'll be pushing these cars to the very max so I'm assuming if they could max out the accelerator mid corner -they would
like professional F1 drivers they make it look easy but I think ( to get the times they do ) it is not
by looking at the steering inputs and listening to the engine for accelerator control
it shows (to me) how much work/skill/effort is going on to keep the car stable
& smooth looking
I'm more than happy for people to use aids (in the simulated rf2 version) if they want a casual experience etc, but in full simulator mode (no aids) it shouldn't seem casual or overly planted
if the feeling of min to med "hard wired" traction control was taken away from this sim car it would really be top
p.s the vids showing the cars doing a leisurely lap (not hot lapping or racing) don't really show the twitchy-ness of a car so much