Caught me in the middle of editing (and shoveling show.)
I honestly doubt the remastering crew's intentions extended beyond giving a nod to TAS fans.
The argument that it would be too much work to build another model isn't all that solid, because both designs are pretty simple, and I'm sure a large chuck of their modeling work is done after-hours to begin with (thanks to CBmount's delightfully short budget.) Besides, this isn't going to "replace" the original, so it doesn't really matter, does it?
At times like this I wish Okuda would do a search for his name like Sternbach dose, so he could come defend his own decisions.

Anyway, taking less time to do it one way isn't the same as the other way taking too much time and it's only a presumption on my part anyway, you'd have to ask Mike Okuda or one of the Paramount Digital guys to get the real reason. Personally though, I think it was a case of them knowing they would need the robot drones down the line for the Whoden (and according to MA. the
Yorkshire too) so that was a given. Taking an extra 40 mins to stick on a crew section & fiddling with the image maps is easier than spending several hours building a different design from scratch. Now that's several hours that can now be spent working on something else. This may seam trivial, but trust me, when you're under a deadline (especially a weekly one) this sort of thing can make a huge difference.
As for a canon explanation as to why the Antares is manned and the Whoden is automated, remember that for the Antares they specifically added an extra crew section to the front, so you could assume that the Class was designed to be modular and easily adaptable to either function (remembering that a starship is largely automated even with a crew.)
It might also be of note that from the registries they're using, the Whoden (NCC-325) is a bit older than the Antares (NCC-501) so you could presume that the Whoden had done it's service as a manned vehicle and had now been relegated to robotic cargo duty.
Regardless, this is the sort of the discussion best taken to the tech or the TOS forum. As I've already stated, this isn't ment to be THAT Antares.
