Review this software specification for completeness and quality.

Critique the following aspects:

1. REQUIREMENTS CLARITY
   - Are requirements specific and testable?
   - Any ambiguous language that could be interpreted multiple ways?
   - Are acceptance criteria measurable?

2. COMPLETENESS
   - Missing edge cases or error scenarios?
   - Are all user types/personas covered?
   - Missing non-functional requirements (performance, security, multi-device sync, service coordination)?

3. SCOPE
   - Is the scope clearly bounded?
   - Any feature creep or unnecessary complexity?
   - Dependencies clearly identified?

4. FEASIBILITY
   - Any requirements that seem technically risky?
   - Contradictions between requirements?
   - Unrealistic success criteria?

For each issue found, provide:
- BLOCKER or SUGGESTION (blockers must be fixed before proceeding)
- The specific problematic text (quote it)
- Why it's a problem
- A suggested improvement

Be critical. The goal is to catch issues NOW before they become costly during implementation.
