To be fair, I've been on upgauges where the auto seat assignments (for J at least) made logical sense. Like 320 A/C goes to A and D on widebody, and D/F goes to G/K... And the extra rows are left empty.
One could argue maybe everyone should be remapped to A and K leaving the middle empty, but that would break up pairs. I do not think same PNR or not is considered?