I don't know that that's the big issue with dyanmicism, at least not for me. In Ruby the main thing that bugs me once in a few months is a silly typo - calling a misspelled ivar or method. It happens maybe once in half a year but it's still humbling when it happens. It's rare because usually your IDE is very good in spotting these mistakes - even in Ruby, and also decently tested code should break right away. But I do wish and hope the tools will become better - whether it's Rubocop or something completely new, that the chance of this happening will be almost zero. It's not there.