  We present a comparison of the AQFT-based Fewster-Verch framework with the
Unruh-DeWitt particle detector models commonly employed in relativistic quantum
information and QFT in curved space. We use this comparison to respond to a
recent paper [arXiv:2103.13400] in which it was argued that the Reeh-Schlieder
theorem prevents weakly coupled local particle detectors from harvesting vacuum
entanglement from a quantum field. Their claim can be traced back to the
mixedness that a local particle detector cannot escape from because of the
entanglement that it must have with the quantum fields outside of the
localization area. We argue that for any realistic scale of localization for
physical particle detectors the effect of that mixedness is negligible, and
that weakly coupled localized particle detectors are not impeded from
harvesting vacuum entanglement.
