for years labs didn't process every film
by itself make sure the time &c were exact to the chart.
they would process a handful of different films / speeds together &c even though
at home you wouldn't. if you look at charts they sometimes
say pushed 1stop of pulled one stop same processing as normal ...
time temperature dilution &c are always important ...
they give a starting point for you to figure out what you will actually do
after you process a roll ... and you are on your second, third. fourteenth ...
i process all my film together, asa 25 - 3200 in the same developer for the same
time without agitation .. i don't sweat the small stuff .. but all that said
i know my working methods and i know what to expect ...