Sirius Glass
Subscriber
That's because people use it outside of its "operating envelope". Generally speaking, replenishing in home environment is a BAD IDEA. We're not supposed to be storing replenisher for a long time, but we do. We are supposed to be monitoring our process with control strips, but we don't. We should be putting a consistent volume through it, but not all of us have. But hey, it's fun and the results (when it works) are fantastic.
But none of that replenishment nonsense makes Xtol any worse or less convenient for one-shot use than, say, D76. Go bulletproof route: mix yourself 5L, don't bother with dilution at first, develop a few rolls using full-strength stock solution and you will love it.
I have to completely disagree with you, but then I have only been using replenished XTOL for a decade and yes I have used replenished XTOL that has sat unused for over six months without a problem.