Pre-production Schedule: When does 'Meticulous' become 'Liability' on set?

Hey everyone,

Terrence here, DIT. I've been kicking this idea around lately and wanted to get some community input. We all know pre-production schedules are critical for planning everything, from gear availability to data flow. I've been on projects, like a recent indie feature where we ran an ALEXA Mini and a RED Komodo, with schedules so detailed they'd make a Swiss watchmaker blush.

The thing is, the DIT guides often talk about a 'reactive approach' on set because things change constantly. A crane shot gets cut, an actor's flight is delayed, weather shifts, the SkyPanel S60-C setup takes longer than expected. We adapt, right?

So, my genuine question is: when does that meticulously crafted pre-production schedule, the one we poured hours into, actually stop being a helpful guide and start becoming a liability on set? Has anyone experienced a point where sticking to the initial, perfect plan actually hindered flexibility or caused more problems than it solved? Curious to hear your takes.