My question was broad enough to encompass non-portable features like these. Do the games studios (etc.) contribute these features? Or is it solo enthusiasts? I

My question was broad enough to encompass non-portable features like these. Do the games studios (etc.) contribute these features? Or is it solo enthusiasts? If relevant corps started adding the same hint flags in every toolchain, then conversations about the need for standard mechanisms might be interesting. But even if they don't get standardized, at least some common and portable fundamental libraries can support macros to smooth over the differences.