The goal is a stabilized approach. You would have constantly changing winds to deal with due to the turn. Managing gusting winds would be a ####show. Not even to mention IMC.
With a circular runway if you have any combination of rejected takeoffs and/or long landings (in particular as you go around the circle you may experience tailwinds) you are going to have conflicts. Add runway surface factors (ice, snow, rain) and you are basically asking for disaster.
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