tailwheel make you a better pilot? or does it just mean you can fly a tailwheel??
It means you can fly a tailwheel. Tail draggers were made back when they didn't know any better.
One of the schools I went to said they insist on instructing on tailwheel aircraft as it makes you a better pilot.
Better than what? If you really want to learn excellent hand/foot coordination then go and learn to fly a helicopter. Or better still learn to fly a trike properly.