Sometimes the use case is simply: keep it organised.
You may not want to sell, give or do anything else with a holding today. That does not mean the information should remain scattered across filing cabinets, inboxes and cloud folders.
A living record
The Passport gives each holding a home. Add what you know, let Bad Angel enrich the public-company information, and update the record when something changes.
If a future need arises, you begin with an organised record rather than reconstructing the investment from scratch.