KOTOR also shows nothing that looks like a planet-wide bombardment. Chalk it up to the limitations of the available animation at the time.
Wait, you mean besides seeing the entire sith fleet turbo lasering taris into rubble? Or the fact than in Davik's hangar the building is crumbling around you?
As for the endar spire, it sploded but that doesn't mean it disentigrated. But back then you didn't have the graphical capabilities to show 100s of pieces of a starship falling planetside