But then with how partisan judges are now, you would get completely random rulings. Better than what we have now I guess, but in theory you could have two landmark cases against, for example, Roe v Wade, and the SC might handle these challenges completely differently depending on composition.
So a commission makes a mistake and this should lead to voter disenfranchisement? Why do you think that’s fine? Completely reasonable to request a small extension of 1 hour when the commission screws up (which inevitably means will happen sometimes independent of party affiliation).
Of course such committees take joint responsibility rather than pointing the finger at one person. These people are essentially volunteers and you will need people to volunteer in the future.