Regarding just Andromeda, I'm going to clip some text from wikipedia.

Controversy erupted in the midst of the second season, when series developer and executive producer Robert Hewitt Wolfe announced he had been released from the show's production [...] The reason for the change was purportedly to make the show more episodic and open to casual viewing.

And

In discussion on his website's forums and various interviews, Wolfe has elaborated that he was released from the production staff after he refused to shift the show's focus more heavily onto Kevin Sorbo's character, Dylan Hunt, by essentially making all of the show's episodes as Hunt-centric.

After that Sorbo become an executive producer on the show. The longer running plots set up by Wolfe were dropped and replaced by episodic low brow Hercules In Space stories. Looking at the quoted text above, it's clear that's exactly what the network wanted. Louder, dumber, and cheaper content to fill afternoon rerun time slots. Sorbo isn't exactly an innocent actor caught up in show with a management dispute, since he was the one who ended up getting Wolfe's job.