Wow, what a terrible comparison. Arranger Keyboard and a Piano are two different animals. My opinion is based on having a Dad who was a concert piano player and me using an arranger keyboard to make a living . Repairs for both are very different, most technicians cannot do both repairs.

The art of playing is different; my Dad could not play my keyboard – and I could not play his piano. Playing keyboard is part me and part keyboard. Playing Piano is me. Most good piano players do not wish to play a digital Piano. The feel, the response is different, and a keyboard use speakers, a Piano uses the entire room.

If you have the time, I believe that learning piano will bring you a new pleasure. It will expose you to a new world. IF YOU CAN, DO IT.
(No styles needed) (smile)
John C.