Rails does better than the rest of the Ruby ecosystem without types because it has strong conventions, but if you’ve ever adopted a rails app that doesn’t follo

Rails does better than the rest of the Ruby ecosystem without types because it has strong conventions, but if you’ve ever adopted a rails app that doesn’t follow these conventions (or follows different ones like in the 3.x days where they were less defined) refactoring things across an entire codebase can be a gargantuan task. Following variable life cycles in Ruby in general is much harder than a typed language. There are tools like pry for this sort of thing, but that’s more work than just having types with good ide integration.