Dynamic languages are ok for toy projects/websites. If you have to build something large/complex/that has to work within constraints, statically typed language

Dynamic languages are ok for toy projects/websites. If you have to build something large/complex/that has to work within constraints, statically typed languages are the way to go. If refactoring "a decent portion of the code" of a project involves only a couple of interfaces/types, it is a tiny project and yeah, using a toy language would probably have been ok for that.