VSCode has been a HUGE deal. Being able to use the same editor for all your languages and all your operating systems is just enormous to most developers.
However, the goal wasn't to make "Linux" a first class citizen so much as to bring "non-Windows" developers underneath the mothership.
It's even beginning to affect the embedded world: https://www.nordicsemi.com/News/2021/10/Nordic-launches-nRF-...