[steego]

Why?

Writing your own LINQ provider is a very niche activity done by people who want to translate or “transpile” C# expression trees into something else.

It is fundamentally a difficult endeavor because you’re trying to construct a mapping between two languages AND you’re trying to do it in a way that produces efficient target code/query AND you’re trying to do that in a way that has reasonable runtime efficiency.

Granted, on top of that, I’m sure LINQ provider SDKs probably add their own complexity, but this isn’t an activity that C# developers typically encourage.