Nope, they don't add. They confuse. From administrator perspective, it sucks when the same conceptual configuration can be performed in many different places using different configuration languages, governed by different upgrade policies, owned by unintended users, logged into unintended places.
Also, I'd bet my monthly salary on that Node.js implementation of this feature doesn't take into account multiple possible corner cases and configurations that are possible on the system level. In particular, I'd be concerned about DNS search path, which I think would be hard to get right in userspace application. Also, what happens with /etc/hosts?
From administrator perspective I don't want applications to add another (broken) level of manipulating of discovery protocol. It usually very time consuming and labor intensive task to figure out why two applications which are meant to connect aren't. If you keep randomly adding more variables to this problem, you are guaranteed to have a bad time.
If you're confused over such things, you're a crap admin.
Oh, so we are launching attacks on personality now? Well. To start with: you aren't an admin at all, and you don't even understand the work admins do. Why are you getting into an argument that is clearly above your abilities?
And, a side note: you also don't understand English all that well. "Confusion" is present in any situation that needs analysis. What's different is the degree to which it's present. Increasing confusion makes analysis more costly in terms of resources and potential for error. The "solution" offered by Node.js offers to increase confusion, but offers nothing in return. I.e. it creates waste. Or, put differently, is useless, and, by extension, harmful, because you cannot take resources and do nothing and still be neutral: if you waste resources while produce nothing of value, you limit resources to other actors who could potentially make a better use of them.