Even that scene doesn't really make sense. Jamie and Cersei were at the top of the pile of bricks, they weren't standing on a pile of bricks before the roof collapsed... why weren't they at the bottom? And if they wanted that powerful on screen moment of him finding his brother and sister and mourning their deaths... they probably should have killed them in a different way, as opposed to revealing it in a way that... really just doesn't make sense. Whole lotta continuity errors in a show that was once famous for it's fantastic writing.
Honestly, it's a huge shame. The cast and staff of the show deserved better than the sloppy writing it received in it's last season (I'm willing to forgive the standard of previous seasons, I think Season 7 got a lot of slack from fans despite pacing and writing issues... because the expectation was it was a season setting up more for the final season.
HBO shows and unsatisfying final seasons, though. I don't know why I expected anything different.