Yeah, BillJ has it right.
TOS being unable to afford to land either the Enterprise or a shuttle every week was why the transporter was invented. The first draft series pitch document dated March 11, 1964 allowed for the possibility of rare landings of the entire hero ship, before that idea was scrapped due to budget limitations.
It's a reasonable belief that all of the in-universe legend about the Enterprise being built in space was a direct result of being unable to land the ship in the first place. Take away the budget limitation that precluded landing the entire ship, and thereby any need in-universe to account for why the ship can't land, and the assumption that the ship was built in space is no longer necessary.
By the way, is everybody forgetting "Tomorrow Is Yesterday," when the lovely lady took a dip in Earth's atmosphere? The only reason she handled so badly then was because the ship was on auxiliary power only, due to time warp damage. As per the dialog from the episode itself, under normal operating conditions she would have had more than enough power to maneuver without any sluggishness.
And anyway, as far as my imagination is concerned, the ship can obviously handle one gee just fine, because that's what the ship's gravity is normally set to! Given that, once the ship is up and running, she will have an artificial gravity field as a routine part of normal operation, it's more than logical to build her on the surface of the Earth.