Dominance of the text editor market. TextMate was pretty meh, Coda I tried and thought was ridiculously overpriced for its total lack of features. Sublime was great for its time, I even paid for a license, but Atom is just too good for its value (free).
But apparently VS Code is becoming extremely popular. I wonder if its literally just because of GitLens (still missing from other text editors).
I do most of my development work in Jetbrains IDEs and am a huge fan but if you don't keep the environment open 100% of the time it takes a long time to bootstrap. texmate is great for fast one offs
I usually have three instances of IntelliJ open at the same time with large Java projects in them. One I'm working in, another a colleague is asking me questions about, another to lookup some related code, et cetera.
Far more than GitLens. Integrated terminal, for example. You can add database tools, Docker tools, etc. The relatively recent addition of SFTP is a first class implementation.
But apparently VS Code is becoming extremely popular. I wonder if its literally just because of GitLens (still missing from other text editors).
Disclaimer: RubyMine / IntelliJ for life.