This is why Synthesisers allow you to control the ADSR Envelope - the decay and sustain on a piano, makes its a bit of beast to sit comfortably in a mix or - as you've noted - fairly dissonant and unmusical when played as a keyboard as opposed to a discrete acoustic instrument with its own preferred range of operation in terms of pitch, timbre and dynamics.
The answer? Tailor the use-case to the instrument, as orchestras have done for thousands of years. A trumpet riff won't sound appropriate or evocative played on a xylophone anymore a Cello aria on a French Horn.
A masterclass on this is Wendy Carlos' Opus 'Switched On Bach', whose entire inspiration was to make "appealing music you could really listen to" using the then-new synthesiser technology.
The answer? Tailor the use-case to the instrument, as orchestras have done for thousands of years. A trumpet riff won't sound appropriate or evocative played on a xylophone anymore a Cello aria on a French Horn.
A masterclass on this is Wendy Carlos' Opus 'Switched On Bach', whose entire inspiration was to make "appealing music you could really listen to" using the then-new synthesiser technology.
https://en.wikipedia.org/wiki/Switched-On_Bach