It's not a loss of sensation and certainly not a lack of brute force strength although arthritis plays a role in the wrist and finger joints.
It's a big imbalance between left and right hand coordination. I'm right-handed so I guess it makes sense for the right hand to be better at things.
I can land consistently on the right keys after 4 years of lessons and daily practice with my right hand, the left hand after the same 4 years definitely lags when playing hands-together.
Does anyone else struggle with this?