Comment by pbadenski

For me personally, it's really important how productive a language environment is after a few years of development. Therefore:

- debugging environment

- memory and CPU profilers

- compilation and linting time of 100k+ codebases

- IDE support for 100k+ codebases

- static analysis & software architecture metric tooling (complexity, dependency analysis etc.)

- inherent scalability of the language, maturity of patterns & practices of scalability