Contrary to popular belief, Ross Atkins doesn't just receive a call from an opposing GM, take a short walk to think it through and then trade away three pieces for one. There's a whole team advising him, running models on the players involved, scouts writing reports, and calls being made all over the place. The Blue Jays front office decided that it was worth moving Sanchez, Biagini and Cal Stevenson for Derek Fisher, just as it was the entire front office that decided it was worth to trade Stroman for Kay and Woods Richardson, Loup for Waguespack, Osuna for Giles, Hector Perez and Paulino, etc.
This same front office has built one of the best farm systems in baseball and continue to acquire pieces to bolster that, prioritizing the future and sustained success over short term gains.