What a stronger FEED package actually buys during construction
A well-developed FEED package will not compress the front end. What it does is remove the ambiguity that later becomes a field change order, a hold on fabrication or an argument over scope during commissioning.
Definition quality shows up in three places: interface clarity between packages, completeness of the equipment and materials basis, and the realism of the construction sequence assumed by the estimate.
Projects that invest in these areas typically report fewer late design queries and a measurably calmer execution phase, even where the headline schedule is unchanged.