• 3.1.2 "Legacy devices do not support the FEATURES_OK status bit, and
  thus did not have a graceful way for the device to indicate unsupported
  feature combinations. It also did not provide a clear mechanism to
  end feature negotiation, which meant that devices finalized features on
  first-use, and no features could be introduced which radically changed
  the initial operation of the device."

This has mixed tenses ('do not'/'did not'/'which meant'). Probably
should all be present tense, since all the statements are still true of
legacy devices now as well as in the past.