Are you referring to this issue? There’s still a mystery there that you somehow broke a route just by deleting a member, which already shouldn’t be allowed. This needs to be a bug report with reproducible steps, not a feature request about the validator.
Maybe I was reading it too literally, but I interpreted the request as being about making sure all the members connect to each other. Validating the order would be another step beyond that. It isn’t a bad idea overall, but iD’s validator is a delicate balancing act; issuing warnings about potential non-issues would incentivize overcorrections.
The discussion left off on a broader point that iD’s validator doesn’t really distinguish between preexisting issues and issues the user has caused, only new issues on elements they’ve touched for any reason. Maybe that distinction wouldn’t be as important if there’s an additional severity level for less urgent messages from the validator that doesn’t count against one’s HYDC permanent record: