[chatmasta]

Because nobody would use docker if installing it required a custom complex build process. This way docker can keep docker CE for its standard use case but also satisfy power users with specific requirements by allowing customization.

[ReverseCold]

I use docker because I can go from

"Hey cool project, I want to try it!"

To already setup in under a minute depending if I'm at home or not.

Also the VMs start really fast, so it's good for getting exotic compiler toolchains on Windows running quickly. Everything has a dockerfile.