I play the cello (though probably less experienced than you, my “main” instrument is the piano) and have perfect pitch. I tried Bach V from both semi-transposed and “in C” notation and for me it’s a lot easier to use the original semi-transposed version. Of course it was strange at the beginning but soon it felt very natural because I knew how it would sound and the sheet music just helped my fingers to correctly produce that sound (like a tablature), especially for double and triple stops. Kodaly then was no problem to read either (too difficult to play, but that was not a notation or reading problemNeeraWM wrote: ↑26 Mar 2023, 10:01 I have a question about scordatura for string instruments.
My current knowledge comes from being an experienced cello player who has gone through Bach V, Kodaly solo sonata, and Dutilleux Trois Strophes.
In all those cases, the notation is "transposed", that is "show me what to play and it will work".
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Trying to play the Devil's Advocate, I will concede that, if you have perfect pitch and read something that sounds different, it will annoy you. But that's what clef reading is for, right?

Some years later I started to learn the (B♭) clarinet and after a week or so my perfect pitch had adapted to hearing a “clarinet G” as G and not as F.
Edit: I don’t think there really is a need for a permanent ossia staff with “in C” notation. Maybe in cases where it’s ambiguous on which strings to play but even there string indications could be sufficient. IIUC, Gould suggests the permanent ossia staff only for full scores which are used for performing (full scores for conducting only “in C”).