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SYSE.29:3 - Forces
| Force | Practical tension |
| Improvement and continuity | A better path may change the assumptions of users who cannot move immediately. |
| Retirement and retained state | Stopping new requests does not remove stored information, evidence or future recovery use. |
| Coexistence | Two paths can lower transition risk while increasing maintenance and compatibility burden. |
| Complete knowledge | Actual consumers may be hard to enumerate; uncertainty must be handled without inventing either zero risk or an endless support promise. |