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Because it is usually a picture. It is drawn for the kick-off deck, printed, and then diverges from the work within a fortnight because updating it means updating a second thing.
The Gantt is a time view of the project's own tasks and dependencies, not a separate chart drawn to describe them.
Bars are tasks. Dragging one moves its dates, and anything depending on it moves too, because the dependency is a property of the work rather than a line drawn on a chart.
A client asks for delivery two weeks earlier. Dragging the milestone shows exactly which phases have to compress and who becomes overcommitted, before anyone agrees to it.
It will not show float you have not recorded. A plan with no dependencies is a row of bars, and the chart cannot infer an order nobody stated.
Estimates and assignments feed the bars, capacity shows the effect on people, and the client portal shows the phases you have chosen to expose.
Yes. The baseline is kept, so slippage is measured against what was agreed rather than against last week.
Yes, from the holiday calendar and working patterns in Nest.
Yes, filtered to the phases you expose in the portal.
Fourteen days, every module, no card. Or half an hour with someone who will run it on your own records and tell you where it does not help.