The issue about happy developers because they are using 'new technologies' (use node! it's a new technology) is a wrong conclusion. This is like Rails 7-8 year

The issue about happy developers because they are using 'new technologies' (use node! it's a new technology) is a wrong conclusion. This is like Rails 7-8 years ago. People using node now are essentially doing greenfield projects - they're writing 'from scratch' code without any major requirements to keep existing code going. Come back in 5 years when someone has to maintain the Paypal nodejs stuff which has become a moderate mess due to weird edge cases, changed business and legal requirements, and try to hire node developers to come in and maintain code written by people who are no longer working there, having moved on to scala/f# projects in 2015. All the new attention will be in 'node 2017', but you'll be stuck trying to make 2017 modules work in 2013 code, and you'll be left trying to patch/maintain something that wasn't as forward-compatible. For true irony, some of those same developers will be brought back as consultants to develop the next-gen 'paypal 2018!' based on some new Scala framework, and the maintainers will have to watch the experts write the next generation of what they'll be maintaining 4 years on. EDIT: "The old story of linkedin where moving to Node.js from Rails for their mobile traffic, reducing the number of servers from 30 to 3 (90% reduction) and the new system was up to 20x faster." I strongly suspect that if the team had been given X months of "rewrite the Rails system using all the current knowledge and techniques, as a new system vs patching the live one", they'd have seen similar results in less time. To the extent that some companies are more SOA flavored than they were 5-10 years ago, this will be easier for everyone involved, of course, but let's not pretend that developers are happy because they're using 'new technology'. They're generally happy in any language when they don't have to work within bone-headed constraints leveled on them by predecessors who were chasing the latest fad before really understanding it.