Why fly fast approaches?

"C J Campbell" wrote
My experience indicates to me that this is indeed the case. Using
some highly sophisticated tools (lawnchair and cold beverage) I have
been able to observe the speeds flown on final many times, and at many
airports. The vast majority are flying final too fast.

Well, OK. But I want to see how you measure the speed of airplanes using a
lawnchair and cold beverage. :-)

It's quite simple. I sit in the lawn chair and face the runway. I
note the beverage level in the container, and begin drinking at a
known calibrated rate as the plane crosses the runway threshold. I
stop drinking as the plane makes its touchdown. By noting the point
at which the airplane touched down and the amount of beverage
consumed, I can easily calculate the average speed flown on very short
final.

Is this not common knowledge?

Michael