This is some awesome thinking!
Why 10 toes and not 12. Why are some bigger than others? Some people can use their toes to pick up things while others can barely move them on command. Some toes are nice to look at while others are definitely not something you want to look at. Toes can be stubbed and make us scream. Toes help us balance and walk. 10 toes are just something to ponder.