has anyone yet explained here why they used so much runway on the
roll out? The news feed I saw had a comment that they stopped with
under
1000' to go. Were they just using thrust reversers for most of the
rollout
for some reason?

The pilot used up more runway because he wanted to hold the nosewheel
off as long as possible. I doubt the reversers were used at all, as
that would transfer weight forward and bring the nose down faster.