> e.g. it will automatically reshuffle your structs to get rid of excess padding
This is just more complexity as well. It introduces surprising behavior that can burn you when creating interfaces or serializing and forces the developer to know that the compiler will be doing such magic.
> forces the developer to know that the compiler will be doing such magic.
Do you regularly order your stack variables? :D
99.99% of cases there are no expectations about details of a `struct` and having to think about it all the time is a PITA. That's a good example how silly defaults in C/C++ are. Just because I might need manual ordering once in a while, does not mean I want to be bothered by it all the time.
