A final count records one endpoint. A retention curve can also show the starting level, rate of change, transitions, variability, and the path by which the endpoint was reached.
The final number hides the path
A final cycle count says when a defined endpoint was reached, but not how performance changed beforehand. Two edges can reach the same endpoint after the same number of repetitions while following different paths. One may decline gradually; another may remain stable for a period and then fall sharply. Those patterns can matter when interpreting performance during the test rather than only at its conclusion.
The curve separates several questions
The first measured point indicates the starting level under the chosen method. The slope between stages shows the observed rate of change. Bends, plateaus, or abrupt steps may identify transitions worth investigating, although they do not establish a cause by themselves. The endpoint shows where the stated stopping rule was met. Multiple runs can additionally reveal whether the observed path was consistent or variable.
A responsible graph should disclose its measurement intervals, axis units, calculation or smoothing method, and the number of samples represented. Measurement uncertainty also matters when small apparent changes are interpreted. NIST Technical Note 1297 provides general guidance on evaluating and expressing measurement uncertainty; it does not establish any knife result or SEWARD product attribute.
A curve must come from observations
Missing intermediate measurements cannot be reconstructed safely from a starting value and a final count. Drawing a smooth line between them would create an assumed history rather than report an observed one. If only the endpoint exists, the publication should present only that endpoint and its conditions.
Accordingly, a retention curve offers more information than a final count only when it is based on traceable stage-by-stage data. No SEWARD-specific curve, rate of decline, or performance pattern should be asserted without batch-linked raw measurements and a documented calculation method.