What goes wrong in the communication between pianist and technician?

The pianist knows what he wants. But he often can't convey it; his fingers are very sensitive and notice the slightest bumps in the track. But how do I tell my technician?

Original quote: Pianist – "the grand piano isn't flourishing today". Technician – "...then give it a good watering". No mention of intonation.

If the pianist is technically inexperienced, a technician might come up with the idea of taking out the machine in the event of a non-specific complaint, turning a harmless screw and, after another test, naively asking "is it any better?" This is said to have happened. Anyone who thinks evil of this is a scoundrel.

And there are intellectual chatterboxes among pianists who must be recognized as such.