> adding/changing/removing code in a dynamically typed language always leaves me worried that I've missed something.

Looking from the other side, this seems like "static typing gives me illusion of safety, and I miss it in dynamic languages". Sure, it might be justified for large projects in the long run, but

> taking the convenience of an untyped language is usually a poor/lazy architectural decision.

sounds like not understanding (or unwilligness to use?) trade-offs involved, due to personal preference.

I don't like these (unintentional?) claims of superiority based purely on personal preference. Static typing is just a tool, with its pros&cons.