Indeed. In the words of Matt Jefferies:
"I constantly had to fight anyone who wanted to put surface details on the thing."
http://ottens.co.uk/forgottentrek/designing-the-first-enterprise/
Part of his reasoning was also that all the important machinery should be accessible from inside the ship, as space is a dangerous environment for both man and equipment.
I don't know
when a Connie might appear, but I would bet my wee bairns that one
will, and that when it does it will look every bit as accurate to the original as in "Trials And Tribble-ations" (DS9) or "In A Mirror Darkly" (ENT), and that preserving its "special-ness" is precisely the reason for the "no round nacelle" embargo.
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MMoM