And why doesn't the space-dock have a transporter facility on site? Needing to beam to a separate trailing facility then shuttling over to the dock, and vice versa, is really, really, really silly.
At 2:29 in the following clip a gantry, (similar to these
becomes visible which would be a logical place to house a transporter.
Scotty was there waiting for him for the same reason as my complaint above - to give Scotty a reason to take Kirk, (and us) on a fly around tour of the new design. And to a lesser degree, so they could have their little talk.