Languages like C++ have never been known to provide fast, scalable development. They are too large and complex, weighed down by excessive numbers of features.

The most productive and scalable language I've ever used is Smalltalk. Thanks to its dynamic qualities, and its "live programming" approach, Smalltalk software can be written in a fraction of the time it would take in major languages such as Python, Java, and C++. Even Go! This is borne from Capers Jones' 2017 study on software metrics (see https://itnext.io/mmxxii-year-long-celebrations-for-smalltalk-e56bf8d6733b).

Thanks to its object-oriented purity and consistency, Smalltalk is infinitely and easily scalable. Alan Kay often likened Smalltalk development to the Internet or biological systems of cells.