I kind-of would like to see a POSIX-strict profile which incorporates commonsense (by commonsense I mean avoiding things that repeatedly over many years have tripped up programmers in frustrating ways) things like no newline in file names. Operating systems (or distributions) or could opt into this profile, and then someone programming on such an operating system could rely on the constraints of the profile and additional facilities could be added on that might need to rely on those constraints. Hopefully, gradually the use of the profile would spread.