"All normally processed films and developers will produce a complete palette of grays from black to white." (Conrad)(posted 8153 days ago)Well, if you process 35mm HP5+ in Rodinal and blow up to 11x14 or larger (not recommended :-), then you see black and white, not a complete palette of greys.
When you talk about sensitometric characteristics, you are talking about average of certain large areas. On the other hand, RMS grain measures fluctuation in averages of small areas. Accutance has to do with more locally transitional aspects, while tonality has to do with overall effects of all these characteristics.