Actually SpaceX is in the process of building multiple Starship launch pads in multiple locations with only an expected theoretical need.

SpaceX is "in the process" of a lot of things, not all of which pan out. So far the cases that have actually started serious construction are in Cape Canaveral, and will absolutely be necessary assuming Starship becomes operational (because the number of launches SpaceX is allowed to do from Starbase is limited).