I'm curious, could you give an example where refactoring is more difficult? I find TS much more easy to refactor because since the structural typing basically just says, for example, "This method argument needs to have these properties of these types", if I find out "Uh oh, this method actually needs one more piece of data", in Java I'd have to change the definition of the type that was passed in which could have lots more unintended side-effects, while in TS I can essentially "localize" my changes just to wherever I call that method.

The "blast radius" if you will with nominal type systems is just always much larger.