I think finding the film / developer combination that will give you a full tonal range, effectively covering N-0.5to N+0.5, is important, as this should cover the majority of circumstances. Then, finding the settings for N-1 / N-1.5 may well cover most of the rest. Only rarely do I need N+1. Obviously this all depends on your style of photography, and what you're trying to achieve, but using the zone system in batches of 6 sheets for development is possible, imo.
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