Something everyone is missing is that this is just feature parity with other langauges, this is not c++ specific. They added it because other languages have the

Something everyone is missing is that this is just feature parity with other langauges, this is not c++ specific. They added it because other languages have these compiler hints which are then (usually) used in llvm as opaque types for 'smarter' optimizations. Hand rolled code will still be better, but there are very niche instances where you want llvm to know this information, especially important when you don't care about performance, but you care about data integrity and obfuscation.