Artisan Science can be used for particular strategies for sure, but using it just to get -1 construction time seems to be the most common; it's a quiet-use science.

However as it happens, Economy has 6 science types to the other two Science's 5 science types. If we merged Tools and Artisan (perhaps with a little nerf, and perhaps not), then all Sciences would have the same amount of types, and the Construction Time/Cost bit would be in more engaged use. Thematically it fits as well.