I suspect the real reason for the unease, from some, of the FDR data release is simply because it breaks with tradition. But think it through. Traditionally, FDR data has been kept confidential until an accident report is issued, sometime years. We’d be naive to think that investigators, even with the best will in the word, didn’t use this confidentiality to allow delays – and to, unwittingly, colour their conclusions to suit their personalities.
Far better to get the data out into the open, earliest. After all, it simply reveals what the aircraft was doing at the time. Why it was doing it is another question - for the formal investigation to answer. There’s enough aviation nous on this web, and others, to gain useful and early information from the TAM FDR which may just prevent the analysis of another FDR.