[azernik]

When he gives timelines? ABSOLUTELY it's wise.

SpaceX watchers call it "Elon Time". When Gwynne Shotwell gives you a time estimate, you can take it seriously (subject to regular engineering uncertainty). When Elon Musk gives you a time estimate, laugh it off and say "that's adorable" and recognize that it's mostly intended to keep investors happy and to put pressure on his engineers.