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The reason for this is the soundboard
It is made of soft timber called Spruce and good Spruce is very, very, very scarce. The soundboard has enough inbuilt tension to hold an upward curve of 7mm against a pressure of some 450kg.
Violins continue on for years because

they are better housed and away from

climate   change, combined with the 

fact that there is a soundpost for

support. The piano soundboard has

no support at all