You haven't heard about Crossfit women, haven't you. Crossfit women can do pullups, handstand pushups, bench press, and other upper body exercises, putting many, if not most, men to shame.
Annie Thorisdottir won the two last years. They are not remotely average.
You have an excellent point. A woman that trains for years and reaches the pinnacle of human physical development has about the same strength as an average male with no training.
In over 20 years of taking the Army Physical Training test, I've never seen a female do more than about 20 pushups, (the average is around 10 I'd say, and they absolutely struggle just to do that.) Not once, in 20 years.
Your claim that there are women out there that put men to shame on the benchpress? Suuuuure.
From my 20+ years of experience watching males and females exercise and take physical fitness tests, women aren't just a little bit weaker than men, but dramatically so.