Today’s miracle of engineering - making a 1957 ranch an open floorplan at minimal cost because you’re going to stick someone else with it.
The old lumber used to be under compression because they used to transfer the roof load to the bearing wall. The new lumber is under tension because the roof is now supporting itself and the joists whose ends are now floating over the middle of the ceiling. The creative use of brackets is pure artistry.
Two of us walked the roof earlier. Surprisingly, there was no significant visible deflection and it didn’t feel springy. There were multiple cracked rafters throughout the attic.
Walking inside the attic, I elected to stop short of the first “floating” joist.