The issue with node is the single threading and having to scale with worker threads AFAIK
People always say this but its not technically correct and can be misleading.
Technically, JavaScript runs single threaded but not Node.js itself and certainly not when using it on the backend in something like Express. IO operations and other things tooling libraries do can cause you to run out of a thread pool. But Node.js, when handling requests, gives you much of the benefit of multithreading without having to deal with multithreaded code.
Renovate is great. Plus there's just something about Github owning dependabot that always bothered me.