In retrospect I wish C++ used fat pointers rather than inheritance for virtual dispatch, like Rust but where interfaces/traits can have fields (Rust traits don'

In retrospect I wish C++ used fat pointers rather than inheritance for virtual dispatch, like Rust but where interfaces/traits can have fields (Rust traits don't have fields and are less powerful than C++ base classes). This prevents accidentally overriding a base class method (eg. QWidget) by declaring a subclass method of the same name, eliminates the need to add a vtable pointer to object instances which you never cast to an interface pointer, and eliminates the need to juggle pointer offsets when performing multiple inheritance method calls, which can cause UB when performing C-style pointer casts and makes decompiling the code a nightmare (possibly fields in traits will add this requirement again, I'm not sure).