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> The reused parts are of higher quality than their corresponding bespoke implementations ….

I think that stating this as an inevitable and uncontested fact might be pushing the point.

Most of the components are multi-platform, partly or fully POSIX-standardized, battle-tested, blazing, fast, etc. It's some of the most widely-used and arguably greatest software ever written.

And some of it is absolutely terrible with several tools overlapping in use cases along with unclear perfornance hints. Even worse is the combination performing worse which may not matter on small inputs but has a huge impact when you crank up the size. Then there's the issue of understanding why performance suffers and in what cases it's better to roll your own custom solution that better fits the problem.

Reuse saves work when your problem maps perfectly to existing tools while what may seem like a minor difference will propagate down your program to end in countless issues from a codebase you don't know.

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