>A platform like Android would have an SDK with all dependencies pre-installed, anything else would be nuts.

Android is usually Java, but you still have to manage dependencies yourself. There is no SDK which includes "all" dependencies, that would be absurd. You are going to create your own dependencies.

For CMake, it is so bad that there are many high effort attempts to replace it, by Google, Microsoft and some others, just to not have to deal with it.