I went to a traditional Indian wedding last night with my family. It was a blast and extremely interesting and entertaining (though very long!).
Most people had sandals or were barefoot. You had to remove footwear to go onto the stage for various events. It was interesting because most of the people's feet had very little arch but had very thick feet (it looked like a layer of fat on the bottom of their feet).
Relevant to this topic, the father of the groom sat in front of me and was visiting from India for the wedding. His heels were a mess. My wife actually pointed him out and said, "You think you've got heel cracks. . .". He had thick ridges of skin on the back of both heels that had too many cracks and crevices to count. So, I think I'll keep trying to minimize my personal crack problems (sorry, couldn't resist) and realize that cracks will just happen and the best you can do is to minimize the damage and allow your feet to heal.
FWIW, he walked just fine and it didn't seem to bother him at all. All the other feet I saw didn't seem to have the same issue though.
I really enjoyed sitting through most of the ceremony with no shoes. I told my wife if we ever renew our vows, we'll make it a barefoot ceremony.