Whilst the semantics about "Long final" etc is an interesting one I think we are straying away from the basic issue.
If you are satisfied there is no other traffic it is perfectly reasonable, subject to noise issues, to perform a straight in approach at an uncontrolled airfield assuming one is familiar. (Although non radio/radio failure traffic is still a threat).
What is not reasonable and potentially hazardous is to barge into the circuit and disrupt traffic which is already established in the pattern.
It should be a part of any pilot's training to learn how to join the circuit pattern at all types of airfield. I observe that some pilots who have learned at locations with full air traffic are somewhat lacking when they fly to airfields with no ATSU.
The reverse sometimes applies to those who have learned at airfields without ATSU etc.