The above strategy is useful for two reasons. First, any prudent and responsible landlord will appreciate this type of concern and will act promptly to remedy the dangerous condition. Secondly, having copies of the letters that you sent that notifying your landlord of the dangerous condition will be a very important evidence in proving any potential injury resulting from failure to repair the condition such as faulty floor, leaking roof, bad plumbing, etc... that lead to an injury of a tenant or a guest at the subject property.
If you don't have any evidence of the owner having a notice of the dangerous condition in question, then it will be very difficult or even nearly impossible to win the underlying injury case.