Could you give a specific example of how this makes you safer? I really don't understand how braking could cause an appreciable weight transfer at speeds I consider appropriate for "bad bumpy roads".
I have never been to Puerto Rico, but in Nicaragua and Honduras is highly advantageous for your health and safety to flow with the rest of traffic. He is completely right, this comes in handy because so many roads (especially in mountain areas) are very inconsistent and messy.
