I'm not sure if you're talking about modules or C++ itself.

It's not, it still the same bullshit where you need to predeclare everything that is written bellow in your file or elsewhere

C++20 modules from 60 years ago when people didn't know how to design modules

They haven't looked at how languages such as D/Rust/Zig/Swift are doing, instead they went blind and they built a "new" thing with the limitations of their old design

What a shame