Protect the User Experience

In this exercise, you're the engineer helping a product evolve without losing the experience that made it work in the first place. The scheduling app already exists, and the team now has enough evidence to justify a narrow host-login improvement for returning hosts.
That does not make the implementation safe by default. The risk is that a reasonable feature quietly makes the product heavier: schedule creation gets more complex, attendee participation picks up account confusion, or returning hosts end up with multiple competing ways to get back in.
Your job is to make the critical user experience explicit before implementation, then use those guardrails to judge whether the product actually improved.
You'll move through a practical decision sequence:
  1. Define the UX invariants that must not degrade
  2. Frame the change in a single implementation brief that keeps the rollout narrow
  3. Implement the plan, then evaluate whether the result protected the product's core experience
By the end, you should be able to explain:
  • which user flows mattered most before the change
  • which UX constraints were non-negotiable during implementation
  • which rollout choices reduced risk to create, respond, and finalize flows
  • which degradation signals would tell you the change helped or harmed the product
This exercise is about protecting trust in an existing product. A strong result is not "we added login." It is "we improved host continuity without making the core experience slower, heavier, or more confusing."
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