It seems to me they didn't build the engine and file structure with source control in mind and that it was an afterthought. They didn't make the setup with unit

It seems to me they didn't build the engine and file structure with source control in mind and that it was an afterthought. They didn't make the setup with unit tests in mind either for that matter. That said, I do track my unity projects in git. It's heavy but works ok these days. What's too much about it for you?