> it still discourages globbing source files and requires re-running upon adding any file or changing anything

Globbing is discouraged exactly for the reason that then cmake can't discover when files should be added or removed from the build process, or build options have changed. But if globbing isn't used there's no reason why manually re-running cmake would be required (there have been some problems in the past with Visual Studio not automatically reloading a modified project, but I haven't seen those problems in a long time).