Hello!
Just as from point of view from someone who sometimes install Lubuntu on
users machines, especially for those users who migrate from Windows. If
you plan to set Lubuntu to lxqt and abandon lxde then I would say, that
is very early to do now yet. I believe LXQt and LXDE variants of Ubuntu
should co-exist together. LXDE one for those who needs stable, reliable,
fully translated, accessible software, and LXQt one for those who wants
evolving, bleeding edge software and don't need complete localizations
and accessibility.