Solow Paradox
The main difference is that PCs actually worked as advertised, back in the day and the reason for this productivity dent wasn't a false promise from the start. Before AI the main use of computers was of a deterministic nature, meaning you get a directly reproducible outcome depending on the input. AIs (especially: LLMs) are probabilistic in nature, the output cannot be guaranteed to be correct, and it turns out just bolting on guardrails on top of the system is a band-aid. In practice, instead of getting a general-purpose intelligent machine which is capable of making autonomous decisions, you get a word predictor with an unlimited amount of possible failure modes.
Ich würd noch ein Seepferdchen, eine Teilnahmeurkunde von den Bundesjugendspielen und einen Fahrradwimpel spenden, wenn der Spuk dann ein Ende hat