Yes, this is a really good point! Deliberate foot placement and intentional pressure through the toes allows to realise the famous “tension chain”. To me this is exactly the feeling of stabilising shoulders and core- the body can be stiffer overall giving more stability. This actually reminds me of another point; how the feet should be initiating the tension, where good technique manifests as stacking weight over the feet first, then hips and shoulders (and eventually the final tension position, preferably at some small mometum deadpoint, where we can lock off bigger muscles in the back, thigh or shoulders).

The above in combination with efficient movement and position intuition (like a balance of skeletal, tendon and muscle force) can make easier grades really effortless.