I think you're probably missing the forest for the trees here... broadly speaking, these multibillion "parameter" (whatever that actually means) models store a lot more than shakespeare, and have storage costs in the 100s of GB/TB (which translates to $$$$$$ in SSD/RAM costs), nevermind the (kilos/mega/giga)watts involved, all the pollution, etc...
Meanwhile, a template (maybe a couple KB) costs less than a couple cents to store and run. Large Languages Models are not really interesting, (smaller) LLMs that only contain "what you need" are.
Meanwhile, a template (maybe a couple KB) costs less than a couple cents to store and run. Large Languages Models are not really interesting, (smaller) LLMs that only contain "what you need" are.