It's only dumb for you because you think it's a dumb. Someone being in charge of telling you what you are allowed to have on a phone that you purchased is significant. Since most people get the majority of their information and the majority of their communication happens on a phone this is a significant issue.Don't compare something as dumb as this to a serious social rights issue.
As Oprah said it's in a billion pockets so if Tim says this billion people aren't allowed to have Facebook then he can lock them out. That's way too much power for one man or even one corporation.
Don't get me wrong I actually prefer the walled garden because of security but it's becoming a monster that Tim Cook is unable to control. There has to be another way.