IMO, the hype over them is because Google, Facebook, et al are trying to gain developer mindshare. Their modus operandi is to hoard as much webdev talent as pos

IMO, the hype over them is because Google, Facebook, et al are trying to gain developer mindshare. Their modus operandi is to hoard as much webdev talent as possible to limit the possibility of a startup usurping them. With front-end development being trendy, this buys them massive brand recognition. The technology itself doesn't need to be new, exciting or practical. All you need is sufficient marketing $$$$$$ backing it.