user-1: Do fully enlightened "persons" still meditate, and why? I get why they keep living, to help sentient beings. But does meditation help in that way?

user11009: Yes, Buddha did meditate. This is for the pleasant abiding here and now.
From the discussion, What did Buddha do to pass his time? --

Some relevant info:

Then the Blessed One, having emerged from seclusion after the passing of
    three months, addressed the monks: “Monks, if wanderers of other sects
    ask you, ‘By means of what dwelling, friends, did Gotama the
    contemplative mostly dwell during the rains residence?’: You, thus asked,
    should answer them in this way: ‘It was by means of the concentration of
    mindfulness of breathing that the Blessed One mostly dwelled.’ …

This means that right mindfulness functions not only as a factor of the path,
  but also as a pleasant pastime for those who have fully developed the path and
  tasted its ultimate fruit.

This quote is originally from the Icchānaṅgala Sutta  (SN 54:11).

-1: <p>Do fully enlightened "persons" still meditate, and why? I get why they keep living, to help sentient beings. But does meditation help in that way?</p>
 11009: <p>Yes, Buddha did meditate. This is for the pleasant abiding here and now.</p>

<p>From the discussion, <a href="https://dhammawheel.com/viewtopic.php?f=13&amp;t=20345&amp;hilit=" rel="nofollow noreferrer">What did Buddha do to pass his time?</a> --</p>

<blockquote>
  <p>Some relevant info:</p>
  
  <blockquote>
    <p>Then the Blessed One, having emerged from seclusion after the passing of
    three months, addressed the monks: “Monks, if wanderers of other sects
    ask you, ‘By means of what dwelling, friends, did Gotama the
    contemplative mostly dwell during the rains residence?’: You, thus asked,
    should answer them in this way: ‘It was by means of the concentration of
    mindfulness of breathing that the Blessed One mostly dwelled.’ …</p>
  </blockquote>
  
  <p>This means that right mindfulness functions not only as a factor of the path,
  but also as a pleasant pastime for those who have fully developed the path and
  tasted its ultimate fruit.</p>
</blockquote>

<p>This quote is originally from the <a href="https://www.dhammatalks.org/suttas/SN/SN54_11.html" rel="nofollow noreferrer">Icchānaṅgala Sutta  (SN 54:11)</a>.</p>
