Very unfortunately, rather than to give us a fast catapult launch, the people in charge of TOS-R revised the entire original (and visible) intention and turned the shuttlecraft into some kind of chopper.
I'd say the TOS-R people put right what once went very, very
After all, the shuttle clearly is
a chopper, as soon as it gets out of the mothership. It definitely has no use for catapult launches when planetside, is capable of hovering and maneuvering at hover, and can land with pinpoint accuracy between the most challenging styrofoam rocks or papier-mache trees. Why would it stop being a chopper when it again enters the bowels of the Enterprise
? There never was any story logic to that, and the shuttlebay "turntable" and "catapult" design made no sense except as an extremely clumsy means of achieving motion with miniatures but without classic (and unconvincing-looking) stop-motion techniques.
If it is "wrong", the idea of a guided rail landing path is repeated in TMP for the flying trams. The TMP Enterprise even carries those 3 rails on the flight deck visible on the exterior model.
I'd argue that the TOS-R FX pushed too hard for a "TNG" vision and ignored alot of the visual cues that even persisted in the TOS Movies.
As to why they'd need a launcher in TOS it could be for important reasons:
1. Save fuel on launches. Those TOS shuttles had a limited fuel supply.
2. Safety during launch as the Enterprise can continue to maneuver while the launch rails prevents the shuttle from accidentally floating into a wall on departure.