If you have a sharp knife and a wet cloth under your cutting board chopping is a joy, otherwise it's a dangerous, tedious, and exhausting task that turns so many people away from cooking entirely
The wet cloth between the counter and the cutting block keeps the cutting block from sliding / moving on you when force is applied, which is more comfortable and safer.
I cook every day, and I’m also a mechanical engineer, I’ve never understood where the sideways force comes from. I’ve also never had a board slide away from me. Tbh I thought this came from chefs chopping on stainless steel worktop. I’d like to understand.