And? Turbo and Borland C++ also had their off-the-shelf C++ runtime to fit into either 64 KB COM files or up to 512 KB memory space with EXE.
In fairness, back then C++ was a much smaller superset of C than it is now.
Same applies to C.
Anyway just search for Jason Turner's talks on targeting Commodore 64 with C++.
Not really. That is, C's libraries grew less than C++'s libraries, over the past 25 years or so.
Do you use everything on the standard library? Uau.
So instead of including a custom runtime they just bailed out...