Exercise 3: Why Choosing AsyncSequence Over Combine in an async/await-Based Project Is a Real Consistency Win — Possible Solution
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TaskFlow, and every real example built across this entire course, has
consistently used exactly one real asynchronous vocabulary throughout
- async/await, Task, and (from Chapter 2) async let and actor. Every
developer who has already worked through Chapters 1-9's own real code
has built a working mental model specifically around that one
consistent set of concepts: a suspension point is always marked with
await, a unit of concurrent work is always a Task, and so on.

Introducing Combine into that same project specifically for handling
multi-value streams would mean maintaining TWO genuinely different
real asynchronous paradigms side by side, each with its OWN separate
set of concepts, its own separate mental model, and its own separate
real failure modes to learn and watch for - Combine's own Publisher/
Subscriber/operator-chain vocabulary and cancellation-via-AnyCancellable
model (Exercise 2's own real pain point) are genuinely different from,
not simply a stylistic variant of, async/await's own model. A
developer reading the codebase would need to correctly recognize which
of the two systems any given piece of asynchronous code was actually
built on before they could even begin reasoning about how it behaves.

Choosing AsyncSequence/AsyncStream instead means every asynchronous
concept in the entire project - whether it's a one-shot network call,
a parallel async let, an actor-protected piece of state, or a genuine
multi-value stream - is expressed using the exact same real
vocabulary and the exact same real mental model throughout. This isn't
merely an aesthetic preference for one syntax over another - it's a
concrete, practical reduction in how many genuinely different systems
a developer maintaining the codebase later has to hold in their head
at once, and it means the auto-cancellation behavior this course has
relied on since Fundamentals Chapter 9's own .task {} modifier applies
uniformly to streams too, rather than needing a second, separate
cancellation discipline bolted on specifically for Combine code.

ANSWER: Choosing AsyncSequence over Combine in a project already built
on async/await avoids maintaining two genuinely separate asynchronous
paradigms side by side, each with its own distinct vocabulary,
mental model, and failure modes. It's a real, practical reduction in
cognitive load for anyone reading or maintaining the codebase, and it
means the same automatic-cancellation behavior already relied on
throughout this course (from Fundamentals' own .task {} onward) applies
consistently to streams too, rather than needing a second, separate
cleanup discipline just for Combine.

WHY THIS WORKS AS AN ANSWER
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This identifies the real, concrete cost of running two separate
asynchronous paradigms in one codebase and explains why unifying on
one - already established throughout this course - is a genuine
practical win, not merely a stylistic preference.