VS plug a headset in and stop being interrupted by irate neighbours annoyed by your enthusiastic musical expression, while still enjoying "real piano" dynamics.
(or waking the kid that you just put to bed in the adjacent room and finally it's that me-time of the day)
Patches / parameter sets / whatever else you call the way to describe it are way more compact and should be much less expensive, shouldn't they? I honestly would expect a competent (if not exquisite) grand piano to be among presets in a good synthesizer.
pianos are enjoyable, but expensive and very heavy