I hate yesterday's NBA, it's absolute garbage to watch and doesn't hold up today, tbh..too many goons, white American players(nothing against them being white, but there's a reason they have been phased out of the NBA), etc..
However, I can't imagine anybody arguing that handchecking doesn't have a major effect on an offensive player

..have you ever played basketball against handchecking? There's nothing I hate more on a basketball court than some out of shape or unathletic putting his hands all over me and/or impeding my progress because he doesn't have the athleticism or lateral quickness to keep up, tbh..having a defender put both his hands and weighted force on your body absolutely affects your game(impeding progress, forcing you off balance, frustration, etc), especially if he's bigger/stronger..
You can call it "soft", but handchecking alters the game to the point where it essentially becomes a contact sport(considering you need to be physical in return to combat the handchecking defender)..it creates hideous basketball..