IDE/editor polish makes a huge difference, and having great individual tools is not the same as everything working together nicely. A great comment from
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Strategies for ramping up, working effectively and having fun when you're not using a mainstream programming language: https://morepablo.com/2022/09/so-you-re-using-a-weird-language.html
The difftastic manual now has a Chinese translation! https://difftastic.wilfred.me.uk/zh-CN/
This a great example of a feature that I could have never built myself :)
Perhaps the biggest driver of docs success is prestige. How cool are the docs tools, and how proud are you to have contributed to the docs?
Which tools do this best? Racket docs look pretty great, for example.