Why did the Suns draft Deandre Ayton instead of Luka Doncic?

Deandre Ayton, Luka Doncic and Trae Young will forever be linked due to the events that unfolded on Draft night in 2018. Now in year four of their NBA careers, they trio find themselves in different situations, with the Phoenix big man the only one of the trio yet to cash in on a lucrative contract extension.