Models struggle in extreme scenarios and don't always adequately account for all meteorological phenomena...its like during winter, when models will print out cirrus over the Berkshires with a 970mb tempest just inside of the benchmark. Its incumbent on the forecaster to account for mid level features. Same deal here...intensity guidance can not entirely resolve what is beginning to happen and what will transpire over the course of the next 36-48 hours. The forecaster needs to.