If you were to come to where I live in the foothills of the Berwyns, I could show you why many cyclists would appreciate a Compact chainset.
There are very few flat areas around here, after cycling for a few hours & feeling a bit of fatigue, I really appreciate a Compact. So would you, if you were to cycle from Llangynog to Bala (for example), along the B4391; the longest part of continuous climb, is 330m over just 6.26km. (1082ft of climb, in just 3.89 miles).
Compacts are ideal - for where I live.
I'm the lad who rode from Llangollen to the top of the Horse Shoe pass on a brand spanking new sparkly Peugeot PX10 Roadrace bike in 1975.
The bike had a 52/38 with a 14 to 25 five speed screw-on. Perfect for a schoolboy.
"What's a Compact?" replied the LBS man when I told him that in 2010, cyclists need really small chainrings to climb up Welsh hills.