The one place where I consider stop bath to be necessary is in RA-4 processing. I've experienced all kinds of random color shifts without it.

I sometimes wonder about all the fuss over stop bath odor. I've been using Kodak "Indicating", but only because I've had that bottle since time immemorial. When I run out, it will be 5% white vinegar diluted 1:4 with water.

Funny - it seems no is offended by a vinegar and oil salad dressing, taken internally... but put a weaker solution in a darkroom ... and WOW!! One seems to need a respirator, chemical contamination suit, goggles, emergency water bath nearby, LARGE ventilation fan...