It's not optimal. We should normalize doing work on Saturday. I'm fine with not having paid work or making it so that employment is four days a week, but most suggestions I've seen imply that the purpose of the new day is to relax.

I think if we pursue this policy the newly available days need to be normalized so that the day is set aside for personal work.

Personally I'd like to see us slowly ease out of employment and demand that more people work for themselves. By most proposals of a four day week are simply against working.