Yes, easy to do and a good idea in your own code but maybe not an option in a library that needs to remain API and ABI compatible with the previous version of t

Yes, easy to do and a good idea in your own code but maybe not an option in a library that needs to remain API and ABI compatible with the previous version of the library that used separate ptr and size arguments (for whatever reasons - for instance Apple might want to harden system libraries without breaking existing applications).