[afavour]

Difficult question to answer because it's difficult to know what you're asking. What is "it" here? Next.js? OpenTelemetry? This specific implementation?

PHP is a programming language, Rails is a framework. They're quite different propositions. What you're seeing here is equivalent to poking around in the guts of Rails, which assuredly has plenty of complexity hidden inside it. I personally have a negative reaction to this amount of stuff in a project but I feel similarly about Rails.

Next’s big “thing” is one codebase that runs both on the server and client. That introduces complexity where you might not expect it. But a Rails app and a totally disconnected JS front end will also introduce complexity, just a kind you’re more familiar with.