The only reason LLMs “work” is because they are trained on a vast corpus of (text-based) human interactions online. The main reason LLMs weren’t a thing 25 years ago, was because there just wasn’t enough scrapeable and useful data available online…

Reduce the dataset to “knowledge as of year 1880” - and it’s not certain you’d even be able to “interact” with the LLM in any meaningful way…