It's quite hard to see, but some trucks offer this, except the middle seat is also the armrest.

manufacturers consistently refer to this option as “bench”. And I think they would pass as “bench” for most people, and most of the things that they would want out of it, even if they aren’t the same as the older style.

I guess I haven't seen that. The older style was literally just a single piece of padding all the way across. So you would literally slide on turns. Even the slightest bump stops you from moving as much.