What the parent posted isn't a criticism, they never said it was a small task or that TJ Holowaychuck's work in the nascent Node ecosystem wasn't brilliant. Just that there is low-hanging fruit available when a new technology of the NodeJS type arrives. If someone has the drive and skill to build high-quality [re]implementations of a large number of key libraries, based on what is available in other (much more established) platform/s, then all being well, that person can do it quite rapidly as the problem space has already been mapped (which then in turn has a huge catalytic effect, particularly as all the APIs they create will follow common patterns).