[ncmncm]

Even in extreme B, they may still sometimes need to import power. Or, they cannot be sure they won't ever need to. If they ever do, they will anyway know well ahead of time.

Clearly B is better, but they get to A on the way there. On the way to B, they may find they import power infrequently enough that they prefer to stop building out. That is a legitimate choice for most.

Cost is all-important, in energy policy.