I think you will find it is all about ensuring the xtypes are loaded and available for the report engine used by weectl report run. weectl report run uses a dummy engine that loads all services as per weewx.conf, but never actually 'runs' the engine, so the loaded services don't actually do anything. Sure, you could have the dummy engine not load a few services to save a few bytes and microseconds, but since weectl report run is run and done in a few seconds it sounds like added complexity for little to no benefit.
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