I am only starting with it myself, so I mostly see the benefits without actually being aware of the drawbacks, but you might consider Elixir and its most used w

I am only starting with it myself, so I mostly see the benefits without actually being aware of the drawbacks, but you might consider Elixir and its most used web framework Phoenix. It has some inspirations of Ruby/Ruby on Rails. José Valim (Elixir creator) had background in it and started creating it when Ruby was trying to solve multi-core/concurrency and somehow found about Erlang and its VM (BEAM).