Yeah, but B5 went into production in 1992 if I'm not mistaken whereas it was around 3 to 4 years later that the Trek TV shows started to move over. That's a lot of time for some aspects of the visual effects capabilities to be improved.
And I do believe B5 always had less budget to work with as well, so perhaps affordability was an issue on top of what CGI could do at the time.
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'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist