Standard library support is not there in any meaningful way across compilers, I fail to see why anyone would adopt modules at the present. MSVC is the furthest

Standard library support is not there in any meaningful way across compilers, I fail to see why anyone would adopt modules at the present. MSVC is the furthest along in its support last I looked. Once compiler support is available, I would expect usage to increase fairly rapidly. As with many things C++, modules are a nice-to-have, adopting a successful strategy from other languages/ecosystems, and many will choose to never adopt them.