The operating system is only a tiny fraction of commercial code out there most of which is either written in (more) memory safe languages like Java, C# or C++. SAPs code base alone is 1 billion lines of mostly C++ and their own proprietary scripting language.
Not to the extent that it is tainted by C's copy-paste compatibility.
Still it does provide a stronger type system, proper string, vectors, reference paramenters and strong type enumerations, to prevent a large amount of C security exploits.
C++ teams that care about security do use such features and respective static analysers on their CI/CD to enforce them.
While it doesn't cover everything, it is much safer than plain C.
Ideally, we will reach a state where both C and C++ get nuked, or ISO C++ just drops its C copy-paste compatibility, which in the end means it is anyway easier to switch to something else.
However that process will take decades, and is hampered by relying on POSIX based systems.
