I do agree that their development communities would shrug at this, but, if every distro drops the nodejs ecosystem from their package repos, the applications leveraging node modules that the users get currently through their package managers -- (most of the notables they aren't getting them from official repos because it's such a flaky set of workarounds) -- will fall into obscurity, and quickly.
Sure, SuperMegaApp3000 in nodejs won't be accessible to users through the package manager (if it ever was, let's be real). That's an environmental stressor for an actor in a system: If there is need for the utility provided, that demand will generate alternatives. If there's not, then those apps, if they want to remain relevant, will end up being rewritten in more sustainable runtimes.
The nodejs developers would quickly realize the importance of these problems they're creating and come up with solutions if the runtime is to survive.
If all these distros continue to grind their wheels toiling at and around this problem that needs solved upstream it takes the pressure off upstream to solve it.
While I'm taking shots at things, librpm needs modernized too. The "alternative package management" problem is springing up bad solutions that are harmful to the systems they operate on. Another topic but with similar drivers.
-C