Thanks for the clarification, Julian. So despite the fact that I don't have any problem with @Robert.Barbiaux's rules, my rules would be:

1. Use #dim only when necessary for code completion, maybe even with a generic comment explaining that that's the reason, for newer developers. The cases I know of are:
   • Julian's case, where a method returns a particular object and the method's signature doesn't specify the exact class (it probably specifies a generic superclass, or the method doesn't exist yet.
   • The exception variable within a catch block.
2. Since I'd use #dim sparingly, I would probably put the #dim right above the variable it applies to.
3. No inline assignment.

Is it because someRespMsg can be different types of objects?

I clarified what I meant by "confusing" in my post. Maybe "useless" would have been better.