Why don't you have your toes amputated. Then you'll know what they were good for. Seriously, I think they help you grip the ground when your on uneven terrain. That would have been more important before they invented hard soled shoes and sidewalks.
They look pretty and are nice to wiggle at times.....they are also handy fof picking things up with off of the floor.... There was a documentary about a young women born with no arms.....she did everything with her feet....she had a baby that she cared for ...she could do up tiny buttons with her toes...cook clean and drive a car.... It was so wonderful to watch her just get on with thing....nothing it seemed was impossible for her to achive...
Balance and agility on uneven ground - the big toe especially. You can get the feel of how it works in yoga and dance classes, or rock climbing. Toes are evolved for barefoot living. Also handy for gripping things to pick up from the floor.
I used to stub my left big toe a lot as a child. Had to learn to pick my feet up more, be more conscious about my movements.