They really hit one helluva pothole with the Howard Anderson company who just couldn't seem to get it together for the f/x. It was so bad they had to cobble together the visuals for the opening credits from essentially leftovers. HA comes across as totally lost and out of their element. If they hadn't been so back logged they should have have dumped HA's ass right there. Instead they ended up having four different f/x houses working for them at the same time.
Yeah this probably explains the massive amount of stock footage used throughout the series, and the reuse of ship shots.
I have to think Roddenberry and the others would have loved
to have varied things up quite a bit more, but they probably just didn't have the time or money to make it happen.