The acceleration of a body is parallel and directly proportional to the force, and inversely proportional to it's mass.
Newton's 2nd law of physics would concur.
I'm just saying that ergonomically, the force applied to the accelerator by your foot feels quite a bit different if you were barefoot compared with wearing a pair of work boots.
It's obvious to me that you have to apply more force wearing work boots to achieve the same depression of the accelerator compared with going barefoot to overcome the mass of the work boot.
Once force is applied to the work boot, however, less force is needed to overcome the spring back force exerted by the accelerator on your foot increased mass compared to lighter footwear.
So the accelerator tends to remain in a fixed position more easily when wearing heavier shoes, but the force required to get it their is greater.
So speaking ergonomically, one would have to decide for himself which is the most comfortable footwear for driving as compared with walking, or running, or any other activity.
It makes sense to me to wear the appropriate footwear depending on the activity. Fpr example, golf, bowling, skating, sailing, running, hiking, driving, etc. Specific footwear are designed for certain purposes regarding safety, performance, style, and cost.
Have you ever tried the Nunn Bush?