What can you do with runtime dynamism that I can’t do with a language using a strong type system with dependant types? You need to know _something_ about the dy

What can you do with runtime dynamism that I can’t do with a language using a strong type system with dependant types? You need to know _something_ about the dynamic data else you can’t do anything with it and that starts to suggest there’s a structure you can declare, right? And what methods do you think are as capable as formal verification? What I mean by that includes formal specification, property based testing, theorem provers etc. Edit: This reads argumentative but that’s not what I wanted, I’m genuinely interested.