What you're arguing about is the field completely changing over 3 years; it's nothing, as a time for everyone to change their minds.

LLMs were not productified in a meaningful way before ChatGPT in 2022 (companies had sufficiently strong LLMs, but RLHF didn't exist to make them "PR-safe"). Then we basically just had to wait for LLM companies to copy Perplexity and add search engines everywhere (RAG already existed, but I guess it was not realistic to RAG the whole internet), and they became useful enough to replace StackOverflow.