"I've never understood people's fascination about SpaceX. There's almost nothing to gain- and Russian Proton has the advantage of being really, really well test

"I've never understood people's fascination about SpaceX. There's almost nothing to gain- and Russian Proton has the advantage of being really, really well tested." On a serious note: the primary disadvantage of glibc is that it's really, really hard to change (and build times are slow). While it's already here, sometimes you want to port it to a new platform or a new ABI, and the adventure begins.