Is Emergency Build useless?

[Captain Kwok]

It's not bad to use with your homeworld at the beginning of a game. Since your planet is already full of facilities, you can build 5 space stations in ten turns where you can build a variety of ships including colonizers, explorers, and transports all at once.

It's also good if you have lots of resources and want to build a lot of units quickly at a planet that's already full of facilities and won't be building anything else afterwards.