Debarking logs with a pressure washer - GIF

[mklotz]

Regardless, this reminds me that I remain in search of a long German word that means, roughly translated:

"When you are happy to see a new way to do something, but also saddened by the realization that you have spent many years doing it the wrong way."

Weltschmerz? Not quite what you want but it covers a lot of territory as many German words do.