Why isn't the StandardGame class final?

A frequent mistake when using StandardGame seems to be that, against it's author's intention, people tend to subclass it. Is there a specific reason why the class isn't final, so nobody gets tempted to even try?

(I haven't thought this through a lot, in fact I never even used StandardGame myself, but that's what I gathered from reading the forum)

That's a very good point…I never make classes final so it just escaped my mind to do such a thing.

The circle is complete, and StandardGame is now final.  Bwahahahaha cough cough …sorry, I might be coming down with something.