I haven't used Groovy, but some quick googling suggests it might have issues with remote debugging. Also, if that quote is related to the surrounding paragraph

I haven't used Groovy, but some quick googling suggests it might have issues with remote debugging. Also, if that quote is related to the surrounding paragraphs, it sounds like the biggest upgrade isn't so much the node.js debugger, as it is the services being rewritten in a decoupled, non-monolithic way. So now devs can test with local copies of software, instead of requiring an entire infrastructure to be online just to test a single function. The decoupling and microservice mindset aren't specific to node.js, you can achieve those benefits in any language, however it is more idiomatic in node than other stacks,