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Yes, but then they also said:

> hopefully design your language semantics to discourage cycles

thus expanding the scope of their comment beyond that specific use case.

Yes, but they said that in the context of a tailored language for persistent/HDD-backed data, where implicitly performance crosses the line into an additional measure of correctness, rather than an orthogonal one. ("to find live references means walking nearly the entire heap including the portions living in secondary storage, and now you're in a world of pain")

So the "increased cognitive overhead" is intrinsic to the problem domain, not an unforced defect of the language design. Overgeneralization in such a case would induce even worse overhead as there'd be no user-level way to fix perf.

You don't always have to walk the entire program heap to find cyclic references, only the fraction of it that may in fact be involved in a cycle. That fraction may or may not be inherently small enough, depending on the kind of problems you'll be working with.

Fair point.

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