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L-in-L interpreters assume that you already have symbols implemented, memory management implemented, reader and printer implemented, ...

You could spend considerably more time implementing a Lisp dialect's math library than the interpreter. There are a lot of combinations.

Where are the objects, hash tables, exception handling, ...

Of course you can get some of these things from a host language, but someone had to make them.

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Yes but my point is that these problems are as hard as we want to make them. For a simple language implemented in C, maybe it's fine to never free any memory until the process quits.

More like, for a simple problem or a sufficiently small instance of a complex problem being solved in C, or a language written in C (simple one or otherwise), maybe it's fine to never free memory until the process quits.

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