Because assignment happens one task at a time and each decision is reasonable. Work goes to whoever is competent and available today, and the competent ones are available less each week.
Nobody sees the total until somebody misses a date or resigns.
Book roles before people where you can — it lets the plan be checked before the politics start.
Check against real availability: working patterns and approved leave from Nest, not a notional forty hours. A week with two people on leave has a different capacity, and pretending otherwise makes the plan a work of fiction.
Yes, until the person is decided.
Depends on the business, but a fully booked plan has no capacity to absorb anything.
Both show the conflict; the priority call is yours.
Half an hour with your own data usually saves reading three of these. The guides will still be here afterwards.