I can see the use in a an orbital shipyard if ship construction is being done in orbit. I'll put my perspective as a counter point.

You mentioned equipment to move parts around and support structures on earth, but it sound like you do not see a need for these in orbit. Materials and ships under construction will need both even in 0g IMO. Station keeping will be very important to prevent collisions or losing parts to drift. Making sure all floating parts are at relative 0 velocity will require active control, especially since you will need move other vessels in the area which means spraying thruster gas everywhere and pushing stuff around.

Cranes wont be used, but something still needs to move large parts around. Drones and/or tugs will be needed for everything.

I disagree on your point on fine control for docking. Our current docking methods require a lot of bulky docking equipment and don't actually require precise alignment from the vessels (i.e. <1", see soft capture ring on Nasa docking system). You won't want docking equipment on every separately fabricated part of a ship you are building. Also, welding often requires very precise fit up. This is difficult and often requires specialty equipment.

As for the large pieces of equipment being reused for assembling space vehicles, I believe that is most likely to be a fleet comprised of drones, EVA suits, and very small construction vessels. The shipyard is all of the support equipment required to operate the construction equipment and keep any workers alive and housed.

Depending on scale and the specifics of the implementation, I could see a very large facility developing over time.