Essay seed — from the Nan Huai-Chin & Bodri Insider's Guide ingest. Not drafted; this is the argument and the spine.
A meditation method that needs no equipment, no beliefs, no posture, no teacher and no prior training. Described by the tradition that holds it as one of the quickest roads to the highest attainment. Easy enough that the instruction fits in a sentence: lie down and give everything up, as if you were dead.
Almost nobody practises it.
Not because anybody disputes that it works. The tradition's own diagnosis is that the problem is the word death in the name, and its proposed fix isn't an argument. It's a rebrand: perhaps it would be more popular if it were called mindfulness of total relaxation.
Same method. Same results. New label.
1. The best thing on the list was ranked tenth of ten, and the ranking is admitted to be wrong. The corpus says outright that this method should have been first, because it contains every crucial element of a practice that leads to real attainment. It's still tenth. Nobody moved it. See The Ten Roads and What Each One Is For and Mindfulness of Total Relaxation.
2. Meanwhile the thing that did spread was a patch. The koan was a small remedial device, invented for a generation of weaker students, and it became the tradition's international face — partly because it gives scholars something to write about. Its fame is offered as evidence of decline. See The Koan Breaks the Egg.
3. So the selection pressure on a practice is not its efficacy. One method fails to spread because of a word. Another spreads because it's writable-about. Neither event is a judgement on whether the thing works, and both were visible to the people inside the tradition, who did nothing about either.
4. Which puts the reader's own field in the frame. Every craft has a signature technique that got famous, and a boring one that everybody who's good does and nobody teaches. The question isn't whether that's true of yours. It's which is which.
What a discipline is known for is a fact about its marketing, not about its method — and the people inside it are the last to notice, because they learned the field through its public face too.