In what Display & Video 360 scenario does it make sense to use inventory packages?

A shoe company is launching a new basketball shoe and wants to execute non-guaranteed ad opportunities with a mix of sports publishers..✅
A beverage company is launching a new tea they hope will be their best-selling product. They created a custom ad unit they want to put on the homepage of a few top wellness websites.
For a new movie release, a movie production company wants to reach as many potential viewers as possible while maintaining a fixed CPM.
A computer company is aware of possible shipment delays next quarter. They want to negotiate an ad deal with one publisher but be able to walk away if the new laptop model doesn’t ship on time.

For the beverage company, it would make more sense to opt for programmatic guaranteed inventory than an inventory package since they want to create a custom ad unit, and PG is more accommodating than an inventory package.

For a new release movie, since they want the impression on Fixed CPM, a PG deal would be more ideal than an inventory package where the CPM is not fixed.

The computer company (Wanting to walk away due to delays): Negotiating directly with a single publisher for a flexible arrangement points to a single Preferred Deal or standard Private Marketplace (PMP) deal. An inventory package bundles multiple publishers together, making it completely unsuited for an individual, single-publisher negotiation.