Failure is only an outcome, not a conclusion.
“In the lexicon of youth which fate reserves
For a bright manhood, there is no such word
- from the play Richelieu; Or the Conspiracy (1839) by Edward Bulwer-Lytton (1803–1873
There is no failure, only outcome of an experiment and is therefore an observation or feedback. This idea is often attributed to Thomas Edison who failed 10,000 finding filament that would not burn before the light bulb worked. He needed to create a vacuum before succeeding. Did he then need to go back a test all 10,000 filaments again?