[tomtomtom777]

The set of features a language provides is part of an unwritten contract:

We write our code such that it minimizes the amount of effort to read it, under the assumption the reader knows the language.

This way, it makes sense not to use a library for something that can already be cleanly expressed by the language because this introduces additional mental overhead for the reader.

Yet is doesn't make sense to avoid modern, simplifying language constructions, as we can assume these are known by the reader.

This unwritten contract is jeopardized by an overload of language features, as suddenly we may want to avoid certain features considered complicated. Hence, the notion of optimal code becomes more subjective.