99% of Physical AI learning comes from 1% of your data — the long tail you can't find

Sethwinterroth · x · 2026-09-08

Adrian MacNeil argues 99% of learning in Physical AI comes from 1% of your data: the long tail — dropped packages, unplanned lighting, failures that appear only after a thousand runs. These moments are hard to retrieve because no one created event types for unforeseen scenarios. You need them to know real fleet frequency and to build training/eval datasets; fixing this broken triage step is the missing link in the Physical AI development loop.

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