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These libraries miss the point of linq. Yes it provides a nifty syntax for munging lists, but Real C# LINQ provides that munge as a abstract syntax tree which can be interpreted before executing it.

This means it can rewrite the native language query, and say, turn it into a SQL or graphql query, or a stream filter, or check against cached data or all kinds of clever things.

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It does seem to miss the "Query" part of "Language INtegrated Query". Though the methods are convenient in any case.

One of the most mind-blowing moments I can remember in my career is when I realized just how powerful the tandem of LINQ and IQueryable was.

Now, writing your own LINQ provider is no walk in the park, but is a really satisfying project and worth doing once, if only to get a deeper understanding of what's going on with expression trees and the inner workings LINQ. It's almost like a language within a language.

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