One of the biggest issues with digital pianos is that the keys don’t have any resistance built into them. This can make them feel less responsive than those that you would find on a standard piano. Since the keys on a digital piano are mechanical in their design, they have a bit of resistance that lets you know how loud or soft the notes are going to be based on how hard you press.
Full-weighted keys on a digital piano help reproduce this feeling. If you get a model with full-weighted keys, you will be able to achieve a better understanding of the different sounds and volumes you can produce with your piano. This, in turn, will allow you to create a much richer sound quality for whatever pieces you choose to play than you would get with non-weighted keys.