If I get up this coming Monday morning and open up Outlook to check my work email, and see that my boss has emailed me saying "We need to add a new function to the SDK that returns a locked mutex by value", I know I'll be able to provide what he wants, and I know I'll be able to provide it for any platform (MS-Windows, Linux, Arduino, Texas Instruments).

If I'm ever paranoid about the Standard's threat of undefined behaviour, I can always look at the disassembled machine code to make sure it does what I want, and if I'm lazy or in a rush or unfamiliar with the instruction set, then I can ask ChatGPT to explain it to me line by line.

Just making the point here that the word 'possible' exists on a spectrum. If your company has a $13m contract to write an SDK that returns a modified object by value, and you need to provide the solution otherwise your company will go bankrupt and you won't be able to afford your child's insulin, then you *can* do it and it *will* work.