[mananaysiempre]

The flags are different because GNU as originally conceived is the Borg of Unix userspace—every option and feature across 1980s commercial Unices must be assimilated (perhaps after minimal rationalization). Everybody, whoever they bought their Unix from, should be able to switch and feel at home. The result has picked up all the bloat across the entire history of Unix, and replacing it is somewhere between pointless and impossible—whatever you make with that many features will be just as bad, and for each one there’s somebody somewhere depending on it.