In the main the standard overhead join is used at airfields where there is no ATC i.e. the radio is operated by a FISO or A/G operator, neither of whom are permitted to give instructions to aircraft in the air. The overhead join, if conducted correctly, is an efficient method of getting aircraft into an active circuit were it is the pilot who is responsible for the method of joining. If you have ATC then aircraft join as instructed in the most efficient manner applicable at the time. The overhead join will surely leave the controllers with nothing to do.