According to that link you posted, many of the other argument parsers don't even generate help, only one other offers multiple interfaces, and none of the others are noted as having color or suggested fixes.

These aren't exactly esoteric features, and you're not going to get them for free. I'm happy to pay in space and compile time for clap to gain those features.

This isn't a case of the commandline app needing to be facebook, but rather putting the exponential gains we've made in storage space to good use providing features which should be table stakes at this point.