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InfluxDB
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One amazing use of symbolic integration: https://github.com/johnbcoughlin/calctex
I think that elisp is one of the many a strengths of Emacs, along with it's strong extensibility, customization, and general user freedom. I think language choice is a smaller part of the pie compared to Microsoft's backing, networking effects within companies, and visual appeal and design.
However, I do agree with you that Emacs onboarding process can be difficult if you don't know lisp, in that you have to now learn a new language and the API for interacting with the editor. That is why some friends and I recently decided to embed JavaScript/TypeScript into Emacs as a means of controlling the editor [1]. We will see if we can prove you right.
[1] https://github.com/emacs-ng/emacs-ng