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Dan Luu wrote about this: https://danluu.com/essential-complexity/ "If you look at the complexity of moderately large scale modern software projects, they're well beyond any software project that had been seen in the 80s. If you really think about what it would mean to approach these projects using old school correctness practices, I think the speedup from those sorts of practices to modern practices is infinite for a typical team since most teams using those practices would fail to produce a working product at all if presented with a problem that many big companies have independently solved, e.g., produce a distributed database with some stated SLO.

A version control system that multi-file commits, branches, automatic merging that generally works as long as devs don't touch the same lines, etc., is a fairly modern invention. ...there was still easily an order of magnitude speedup available from better version control tooling, test tooling and practices, machine speedups allowing faster testing, etc. ... For large projects, just having CI/CD alone and maintaining a clean build over building weekly should easily be a 2x productivity improvement"