It&#x27;s not fundamental to the science case. Nine of the major topics in the science case, if you read it, are hemisphere specific. It is not emphasised that a northern telescope is a big deal, few astronomers will have access to both.<p>This a national level project, institutions aren&#x27;t making funding decisions. They do not consult the funding countries every time WFOS is redesigned with different performance. They did not consult them when the AO IFS MOS was replaced with MOSfire. With a big project like this the performance isn&#x27;t well known at the point when you commit funding.