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Because the last one was set up by somebody who has since left, and the only record of how it went is in the finished task list. So it gets rebuilt from memory, and the step that caused trouble last time is forgotten again.
A project template is a saved shape of work: phases, tasks, estimates, dependencies and roles, applied when a project of that kind opens.
A template holds the structure and the estimates rather than the dates, which come from the start date it is applied to. Applying it creates the plan; editing after that is normal project work.
A data migration is your fifth this year. The template brings the discovery, mapping, dry-run and cutover phases with the estimates that proved right, and the checklist step that caught the problem last time.
They will not make an unfamiliar project predictable. A template is a record of work you have done before; the first of anything is still an estimate.
Templates draw on estimates from completed projects, so what they suggest is what actually happened rather than what was hoped for.
Yes, which is usually the best source — it captures what happened rather than what was planned.
No. Changing a template affects projects created after the change.
Yes, per template variant, where a client's process reliably costs more.
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.