Why does it matter for them if the top selling titles are Nintendo’s? Whether or not Mario Kart sells 30M is irrelevant for whether or not they make a game that sells 10M (as an example). Nintendo could make ten Mario Karts that sell 30M and it still wouldn’t matter. They should look at themselves. If Fifa 20 sold worse (if it even did) than last years version its not because Nintendo sells a lot of games, its because they stupidly put the degrading “Legacy Edition” front and center on the box. But EA is EA and EA is incompetent.
Because that has been a longrunning method to brainwash the gaming community into believing that it matters how much games a console manufacturer sells and ultimately paint Nintendo as some sort of devil in order to steer gamers towards PS and Xbox consoles. Anyone who steps back and looks at the big picture will ask how it helps EA that Take Two sells a lot of GTA or Activision a lot of CoD. If the thought process is that Nintendo is taking sales away, then logically every other big game publisher should be detrimental to any given individual software publisher.
More on topic, if EA's market research showed that shitty games don't sell well on Switch, then it's the correct call for EA to refrain from putting more games on Switch.