All footprints are valid, and all but one have been appropriately squared. They would be more accurate if they were smaller; pitched roofs tend to overhang walls, so draw at or within the edges of the roof. See how I mapped theses buildings in Changeset: 164947758.--- You appropriately modified the residential area to prevent it overlapping with footprints.--- Rather than deleting and redrawing features use the replace geometry tool (ctrl.+shift+G), or the conflation plugin to modify features while preserving their meta data and history.--- Thank you for mapping.
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            Published using OSMCha: https://osmcha.org/changesets/164939416
            