meeting the cardassian poet might have been interesting since it would show a different aspect of to them.
and i cant remember but during this time,, isnt it before the military take over of cardassia so you might get a glimpse of totally different carddassian that what was shown on ds9.
as for betazaid it would have been more sense since it is supposed to be prerry close to earth.
as for observer effect it is one of my fav episodes.
and it has something that is hinted at within errand of mercy.
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that the organians will play with memories of people to hide their true nature/.
spock was pretty puzzled about the contradictions from the earlier surveys of the planet ruins and what was actually present.