alt Hacker News>switching out an LLM is both cheap an easy.
Honestly, these days probably less friction switching out Redis or Elasticsearch (backend) than changing LLM provider (human facing).
Fable is seriously good enough now to, in a 20k line project, take "replace Mongoengine with raw PyMongo" and not screw anything up.
Agents will make all of these migrations trivial. I expect margin collapse across a lot of tech darlings.