I purchased several bright patchwork tops from an estate sale - made by 'Grandma'. I intended to finish them and use them for prayer quilts for the church. Apparently Grandma didn't realize the tension on her machine needed adjusting and the backs were very loopy. When I saw that, I was done. Another member of the group offered to take them home and redo them. I haven't seen them since.
So I guess the answer to whether I would redo someone else's work is no.