I'd prefer it in library but there are a number of issues with that currently, the larger of it being that the landscape moves too fast and library wrappers are

I'd prefer it in library but there are a number of issues with that currently, the larger of it being that the landscape moves too fast and library wrappers aren't keeping up. the other is, what if the world standardize on a terrible library like langchain we'd be stuck with it for a long time since maintenance cost of non uniform backend tend to kill possible runner ups. So for now the uniform api seems the choice of convenience.