These days - the digis are able to inject other forms of interesting and wonderful 'goodness' into the sound, so that the piano player is able to get adequate variation and richness to generate music that provides every bit an excellent or outstanding musical experience.
Those very skilled pianists - including classical etc - will find ways to get the best out of any particular piano after they take some time to check out its behaviour, and then it's piano time.
Piano players can and will be hop onto any piano and give an excellent account of themselves. And when the time comes for a classical concert pianist to prepare for a concert, then they will have their preparation processes, and the show goes on.
It's known that at least one very well known concert classical pianist was/is using not only digital piano in their home ... but in particular ... playing digital 'slab' piano in their home. Their own digital slab piano. And it's not for advertisement, and not necessarily to practise her concert classical pieces, but we can expect they will/can play classical in one form or another on any workable piano.
There are examples of her digital slab online, which she parks very near to her acoustic grand piano, parked front-to-front (face-to-face) style, so she can hop from one to another by just turning around.
It is this concert pianist here ...
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