meursault, was it really necessary to post the whole of the key when no-one was asking you to? If you want to be helpful, why go against what people are requesting?
I have never seen any solver on here ask for more than a nudge towards the next step, or parsing of the last few clues. I would have been very annoyed if I'd read to the end of your post without realising what you were about to say. Working out the Playfair key (which was possible 'progressively') was the only real PDM in what was otherwise a tough slog.
This site is much more encouraging than AB towards new solvers and I am grateful for your and others' expertise. But perhaps you should stop worrying about the self-imposed rules of that other site. This seems to be your motivation for giving unsolicited spoilers. Surely there's a middle ground for just the hints people ask for?