alt Hacker Newsagree on that and the speed is fantastic with them, and also that the dynamics of questioning the current session's assumptions has gotten way better.
yet - given an existing codebase (even not huge) they often won't suggest "we need to restructure this part differently to solve this bug". Instead they tend to push forward.
You are right, agreed.
Having realized that, perhaps you are right that we may need a different architecture. Time will tell!