"Serverless" is basically yet another manifestation of the fact that (despite recent controversy about, well, him being weird) Stallman was right about open-source. The alternative to serverless - open-source products like Mesos, DCOS, Nomad, etc. - offer the same functionality to engineering organizations at lower cost with vastly more pleasant (and manageable) support for things like CI. It's been a great money-making scam for the "cloud" companies though. "Serverless" is closed-source by nature, and it will never be as efficient as open-source solutions.