Different .c/.cpp files being a barrier to optimisation always struck me as an oddly low bar for the 21st century. Yes I know the history of compilation units b

Different .c/.cpp files being a barrier to optimisation always struck me as an oddly low bar for the 21st century. Yes I know the history of compilation units but these days that's not how we use the system. We don't split code into source files for memory reasons, we do it for organisation. On a small/medium codebase and a decent computer you could probably fit dozens of source files into memory to compile and optimise together. The memory constraint problem has largely disappeared. So why do we still use the old way? LTO seems effectively like a hack to compensate for the fact that the compilation model doesn't fit our modern needs. Obviously this will never change in C/C++ due to momentum and backwards compatibility. But a man can dream.