The D programming language lacked a “killer app” to break through. Another brilliant language suffered from this situation, objectively deserving a much better fate than the one it had; Smalltalk.
My personal project during the pandemic was Conway, a project providing implementations of Conway’s Game of Life in as many programming languages as possible.
From 2013 to 2019 I lived in a small town, thirty minutes north of Zürich by train, called Schaffhausen.
A New Programming Language Every Year
Somewhere I read that it was a good thing to learn at least one new programming language every year; I think I have kept up that trend since 1992: