It doesn't really because there's no way of knowing how well Chelsea would have done with more stability.
True but we've done very well without it which when compared to say Arsenal shows there is more than one way to skin a cat. It will be very very interesting to see how United fare in this department in the 10-15 years post Ferguson.
You have enough league titles too, more than you do FA Cups in fact. You don't have many COCs though. Go get your hands on some COCs.
A mere one off. These seasons where we dont win anything usually happen every once in a while then there tends to be a long wait until the next.