“I haven't failed! I’ve discovered a thousand ways that won’t work!” – Edison(quoteinvestigator.com)
quoteinvestigator.com
“I haven't failed! I’ve discovered a thousand ways that won’t work!” – Edison
https://quoteinvestigator.com/2012/07/31/edison-lot-results/
If the byproduct of experiments isn't useful and you can't tell how close you might be to a solution, it may not be a failure because you are refusing to give up, but not exactly success either.
Actually the perfect definition of this is obsession. Not exactly healthy but often a necessity.