It's all to do with building feel for the aeroplane, Armchair.
Taildraggers don't land themselves, and competency at aerobatics teaches you what makes an aeroplane fly, and why it sometimes stops flying, and sensitivity through hands, feet, and eyes to it being about to depart through constantly provoking such departures deliberately, in the way that driving a PA28 straight and level never will.
Oh, and recovery from unusual attitudes; if you can recover instinctively from a botched stall turn in a Yak52 that's on its back spinning (as they tend to if you let them) managing not to stall an airliner from 38,000' all the way down to the sea would be a piece of pi55.
Last edited by Shaggy Sheep Driver; 30th Nov 2015 at 20:34.