One thing that is missing from this whole discussion- lack of tradesmen and the allocation of the tradesmen. If you look around the yards, not many young bucks out there, and with a lack of a non-college professional track in high schools, we won’t replace those workers.
The bigger issue - a project sup does not receive a group of tradesmen that are his. They are shared amongst all projects, so you could need a specific trade and they will not be available because of growth work on another project, worker is sick, worker called in sick because of a union thing, etc.
A lot is on the ship - you have to do the little stuff every day underway and be honest with what isn’t working.
This is the problem - not the type of software we use to plan. You can plan with anything- pretty sure that Noah built the Ark on time without help from a computer.