This is a misunderstanding of either the bitter lesson or what was being claimed, on multiple accounts. Firstly, the bitter lesson is merely about human expertise-tuned algorithms vs. throwing raw compute at a domain. But, notably, it
is still domain-specific. No matter how much compute you throw at training an LLM, it is never going to beat a Chess engine at Chess. If you give a Chess engine 1,000,000 compute units and a general-purpose LLM 1,000,000 compute units, the Chess engine is obviously superior at Chess; ergo, there is value in throwing compute units into training models for specific tasks. This is true for within several orders of magnitude of compute, in fact. It's also true that if you give the Chess engine 1000 compute units it'll still beat the all-purpose model with 1,000,000 units, so actually there's
a lot of value in training for specific tasks.
Secondly, the bitter lesson is predicated on compute being cheap. There was a period where a hand-tuned algorithm informed by human expertise would outperform a raw alpha-beta search at Chess. Then compute got cheaper, and DeepBlue ascended to the top. Compute is now expensive again relative to the tasks being performed. We are absolutely still in a period where human expertise in training LLMs will outperform a naive approach with more raw compute.