Why monstrosity? I've not had any issues and their docker container is quite convenient.
They even provide you with a fully offline SDK. Extract it and open a terminal and build things. No dependencies, no docker, no nothing.
Your criticism regarding their usage of cmake and the kconfig language hold a bit more water. I've never had any issue with the kconfig system (at least not since they've reimplemented the menu system in python instead of whatever it was) but I have hit CMake limitations a few times.