Tangoalphad, St. Pete Florida airport is controlled. So we inform the tower of our position, our intentions, and do nothing without permission. My orbit for spacing had been approved.
The change of runway implied that if the other traffic had completed their approach and landing on 27, and I was still arriving on 36, it could be messy.
Always a good idea to let other traffic know what you intend. And at a controlled airport, you are required to do as the controller requests!
In a rented aircraft, always possible that the radio connections are not working properly, so verify any instruction that doesn't make sense.