It would be futile to expend a lot of effort maintaining a redundant skill.
Unfortunately that leads to a slippery slope where what is and isn't a redundant skill gets mixed in with which skills cost the most to attain/maintain.
Depending on your area of operation you might decide almost all manual flying is redundant and end up training and assessing pilots as competent but only in a very narrow field of ops.
If that is what is desired by companies/operators then fine but don't come crying when your 'plastic pilot' spears in if the airborne situation suddenly changes to something outside that very narrow field of experience.