Wheel uncompetitive

It has nothing to do with assists that can and cant be turned off. And things cant be “setup” properly cause wheels are fundamentally broken in their implementation.

You waffled on for no reason (and are wrong about it, also indignant) when this whole topic has been covered, in depth, with developer input.
Just stop.

Like here. If you “knew” then you would also know that:

When you plug in a wheel, as Blue already stated, that filters that are enabled (cant be disabled via menus) are automatically disabled when a wheel is detected. Thus, it is recommended you leave that setting on Normal. Switching this to Sim with a wheel introduces a bug. Just because you havent noticed, doesnt mean you arent affected.

Gamepad filters off is a wheel only option only available on PC. This removes whatever remaining hidden input filter exists. Read the FFB thread.
FAQ1/2:

What steering mode should I use?
Normal.

Why does sim steering have an effect?
Bug.