Tuscany is a very large region but towns are often very far apart.
Using public transport for tourists would be too much inconvenience because you should make too many bus and train changes. And in that case the costs would obviously increase considerably.
Make my Day in Italy makes you have a comfortable and fully equipped van at your disposal and a driver who will try to satisfy your desires indicating the best solutions to try to optimize the time available.
Tours can be customized without becoming a photocopy of prepackaged tours.