The remark about the use of color is all true; BUT, to be fair, at the time NBC also owned RCA - and the producers KNEW NBC liked shows that HELPED sell color TVs.
In that regard, a science fiction show (like "Star Trek)" or a fantasy based series (say "I Dream of Genie") were probably the best possible "vehicles" to help promote the (then) recent development of color television. One might not be able to do that as well with say, a western, because most of the time, the palette would be somewhat limited, keeping to "earth tones", browns, tans, muted greens. Oh, there could be exceptions, like the cowboys visiting the local "house of ill repute" where the production could go crazy with vivid reds for velvet curtains, tassels of shimmering gold, etc. But it would be very seldom the ranch hands come across a cotton candy pink pony.
But Star Trek, by its very otherworldly nature had a built in reason (okay, arguably "excuse") to depict a much bolder range of colors. A lime green skinned woman? Shoot, that's not out of place, it's almost expected! I'd say "trope", but that word (as far as I know) did not exist in the mid 1960s. Computers with flashing red, green and blue indicators? Of course they flash in bold primaries! Railings painted "cautionary" red? Certainly! You wouldn't want to collide with or flip over them! Okay, I'm stating this with an air of hyperbole, but just to emphasize the point.
It's been argued that Trek stayed on the air as long as it did, despite mediocre ratings, not because of some overly hyped letter campaign, but because the show did help to sell those sleek color TVs made by RCA. Not everyone was watching, but many of those who did bought those color TVs to see it in its full, garishly colored glory. When the sales leveled off, or possibly dipped then it's possible NBC said, "okay, let's wrap it up, gang!"
I honestly wonder if Trek had stuck with the more subdued palette of the first pilot, might color TV sales not much as numerous, resulting in a cancellation after just a single season?