There are a number of manufactures that still fit sliders and buttons etc, so it’s not all despair.
From the 3rd party info on Tyros 3 so far, it looks like they have also reintroduced sliders. (I hope they are motorised like they were on the FX range of Electones/Organs)

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).