Kinda depends on if it's more important to be on time vs complete. Sometimes hitting a window of time is more important than getting the feature done perfectly,

Kinda depends on if it's more important to be on time vs complete. Sometimes hitting a window of time is more important than getting the feature done perfectly, like for an industry event that could build buzz, or a specific holiday season where being late means a lot of lost sales. The worst deadlines are fixed ones for no point, though.