Because everything is fine until it is not. A supplier confirms two days late, and whether that matters depends on four downstream tasks nobody has looked at since the plan was written.
With a fixed date, slack is the only thing that matters, and it is the one thing a task list does not show you.
Tasks carry real dependencies, so a delay propagates through the chain and the effect on the fixed date is immediate rather than calculated. The Gantt view is the working view rather than a document produced for a client.
Recurring pre-event checklists mean the same twelve things happen for every event without being rewritten each time.
It does not manage ticketing, registration or seating. It manages the work of delivering an event and the money around it.
And it will not create slack that does not exist. It will show you the day it disappeared, which is usually earlier than anyone thought.
Supplier costs logged against the event produce live margin, so a budget overrun is visible while there is still time to trade something off.
Books bills the client from the sold lines and settles suppliers from the same record, so the reconciliation after the event is a check rather than an investigation.
Products, not integrations. Each one reads the same record, so a join is a permission rather than a sync job with a mapping screen behind it.
Dependencies propagate, so the effect of a slip on a fixed date is immediate.
Yes — project templates carry phases, tasks and dependencies.
Yes, against the event, with live margin in Books.
Half an hour on your own numbers is usually enough to say whether Loop is the right place to start.