This is true with any tech until it gets traction. React/Next is backed by a big company, but Vue/Nuxt still managed to grab its piece of the pie.
In order to get traction Erlang / Elixir needs enthusiasts who are ok with risking and introducing it to their company or product, at least partially.
No offense, but instead of condemning the Elixir ecosystem, why not embrace it in your company or product, as many have done (including me)? I think most devs should be OK with taking a tolerable risk if they see opportunity to increase productivity by N times