Even from the POV of micro-frameworks, the JS ecosystem sucks. There's just so many competing half-baked libraries doing the same thing slightly differently and incompatible ways.

Compare this to the Ruby ecosystem, where every framework (including Rails) uses Rack, which means that all the frameworks compose together, if that's how you'd like to modularize your monolith. Or the other ecosystem known for its preference for libraries over frameworks, Go, where everything is standardized around http.Handler, so whatever you pick is basically guaranteed to compose.

And it's not just the lack of good overall frameworks, it's the general lack of good defaults for libraries in Node-land. Among the most popular ORMs/query builders over the years there are some surprising omissions, with Knex not supporting connection pinning or Prism not doing database joins by default for a long time.