Listening to this the other day, I really felt that it belonged with Op.130, although the new finale works perfectly well, and no one would think anything of it had the grosse fugue not existed. Beethoven was reported to be furious when the fugue failed to be appreciated and must have reluctantly agreed to replace it. I think it is the grosse fugue that suffers by being a separate entity, rather than the quartet with an alternative finale.
Mozart's fugue in C minor for 2 pianos (k.426) (which he arranged for string quartet) - a work which Beethoven copied out - is similarly 'shocking and modern' - anyone who thinks Mozart only wrote pretty music should listen to it!
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'Man know thyself'
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