"It reads more like a value object"

This module is the payoff. You've learned the concepts and the Fusion mechanics; now here are the real comments you got on real PRs, with who said them and why, so the abstractions land on the exact moments you met them. We start with the richest one.

On PR #508 (the per-flight notes work), you had modelled a flight note as an aggregate root with its own int Id. Mustafa's comment, on domain/flight-notes/FlightNote.cs:

This is the identity litmus test from Module 1, Lesson 3, applied to a live decision. Ask the question about the note: two notes with the same flight-key and the same body, are they the same note or two different notes you need to track? They're the same. A note is addressed through its flight, not through an id of its own. By the test, that's a value object, not an entity, and certainly not an aggregate root with its own identity.

Notice the second half of the comment, because it's a general lesson about justifying design. The original doc-comment defended the note's surrogate identity by pointing at a future "group note" feature. Mustafa's move: group notes are descoped, so that rationale can go. You can't hold present complexity up with a feature that isn't coming. When a design's justification rests on speculative future work, and that work gets cut, the justification evaporates and the design should follow.

And there's a payoff to getting the classification right that the comment flags: once the domain type is FlightNoteVo, the persistence row is free to take the clean name FlightNote, instead of an awkward FlightNoteRow/DomainFlightNote alias dance. The right domain classification simplifies the persistence naming. Good modelling pays rent downstream.

You'll notice you didn't argue this one, you took it and reshaped the model, which was right. The lesson to carry forward isn't "trust Mustafa," it's "run the litmus test at design time so the reviewer doesn't have to." The next lesson is what fell out of this reclassification: because the note became a value object, and value objects are immutable, the whole persistence strategy changed.