Melakon wrote:

Retrofitting an episode from a 80s-90s ensemble series of 9 players into a 60s show with 2-3 leads and lower billed supporting cast means major story revisions.
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How so? There were very few episodes of TNG in which each character played a vital part. In most of the Riker-centric episodes, for example, you wouldn't need someone with a Visor.