I do intend to use cowboy. I guess I should have been more clear. There are definitely parts which I don't want to reinvent for obvious reasons.
But yeah. Product logic and security without using frameworks like Chicagoboos, Nova framework or Nitrogen is what I meant when I said no framework. Replacing any possible crypto parts or critical libraries like cowboy is not the intend.
yeah. you can get pretty far with it. i remember doing a similar experiment where I used just cowboy and plug without a framework (ie pheonix) when playing with elixir.