Take it from me crazy 4, it WILL affect the accuracy. Why do they do it.......... Let me explain it in another way. Do you remember the craze for fitting air-dams to the front of cars in the early 80's? Yep.......... every cheap shix car owned by every boy racer in the village had one. And the less brains they had, the BIGGER the fxxxxxx air dam!!!!!!! Add to that a rear wing spoiler made of flexible fibreglass. No kiddin'........ Why did they do it when your average jo who took the effort to put his hand out of the car window at anything over 2 mph could have told them that it WILL act as a brake. I'll tell you. They fell asleep in the school physics lesson that dealt with forces, thought it looked good - and did it.
Same as those the cut the fore-ends short.
There will be other less humourous reasons why and a lot if it is to do with harmonics. And, as I say, to REALLY understand that you need a degree in music!