The problem is that as soon as you support multiple platforms, the exact same action of "building files from other files" can look fairly different. Since if you use make you want your readme to be: "cd folder; make -j" and since you don't want to write multiple entirely distinct set of makefiles for different platforms, this turns the makefiles in a hellish mess of special characters.

And all that just for executing a set of tasks in a DAG much slower than ninja