I was happy to see content scheduling added in Backdrop 1.10 but surprised that there was no option for scheduled unpublishing like wordpress has built in and like the Drupal scheduler module has. Since it was still not added in the new 1.11.0 release, I thought I would bring it to your attention. I would highly recommend that you add that feature.
I think the most common uses for scheduled content are going to require unpublishing at a specified time. Like promotions, sales, holiday or seasonal events, etc.