The early internet and smartphones (the Japanese ones, not iPhone) were definitely not "immediately" adopted by the mass, unlike LLM.

If "immediate" usefulness is the metric we measure, then the internet and smartphones are pretty insignificant inventions compared to LLM.

(of course it's not a meaningful metric, as there is no clear line between a dumb phone and a smart phone, or a moderately sized language model and a LLM)