I didn’t say he was an unfocused composer or instrumentalist.
He was an unfocused artist.
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So an unfocused artist can be a peerless instrumentalist, create focused compositions, and play his instrument in a focused manner? So his lack of focus as an artist had no bearing on the art he actually produced? On what possible basis, then, do you suggest he was an unfocused artist? And if his lack of focus as an artist did not impact the artistic product, why then even mention it?
I think these apparent contradictions stem from your attempt to make the subjective objective.
On this basis his work was the equivalent of an extremely talented writer who wrote a large number of well-written fragments of stories - rarely finishing any complete story - and strung the fragments together randomly.
You would say that despite the beauty of his prose and his command of language, his ability to create coherent naratives was lacking.
I would compare him with Franz Kafka in some ways, who never completed a single novel and only a few short stories. The vast bulk of his work consists of brilliantly written but unfinished pieces.