Ignoring the fact that Steph does play defense & has had moments where he looks perfectly fine vs the likes of Harden, LeBron, Ja, etc. in the playoffs. Whether that’s with help defense or not. The most important thing is your impact on winning at the end of the day & offense matters way more than defense unless you’re a C in the NBA. Best offensive player in history is more valuable than beat defensive player.
Also It’s not like Magic is a defensive force yet he’s in everyone’s top 10.
That requires either watching the game live closely & attentively, or more commonly watching a replay of the game to be able to break it down. Two things a casual watcher simply doesn’t do. Majority of fans don’t do that which I don’t blame a percentage because it’s kind of hard to find breakdowns of certain games or even getting a full replay for free. YouTube usually just has highlights which is not a substitute.
Also some people just like to spread narratives to support their favorite player.