Windows was the most used desktop OS for development before WSL. Here's the 2015 Stack Overflow survey, which also includes the 2014 and 2013 results for comparison [1].
Here's the 2021 survey's OS results [2]. It shows higher WSL usage than the AoC survey, but still only 3%.
[1] https://insights.stackoverflow.com/survey/2015#tech
[2] https://insights.stackoverflow.com/survey/2021#section-most-...
We all know the "other" issues with Windows but besides privacy (which feels disgusting to even say btw), it's really solid, fast and feels ok to use. I do a ton of dev / ops related work on it and don't have too many complaints from a technical standpoint -- lack of a first class tiled window manager is the only big one that comes to mind.