BOwling yorkers is hard and esay to put away if you know what to expect. Only swinging yorkers are good. Which explains Malinga in a nutshell. But would you have a large scoring match or a low scoring match. It is more fun when the batsmen hit the ball
Surely the only way to make a yorker easy to get away is to get down the track and make it a full toss. You're already at a disadvantage if you're trying to do this. The trick for the bowler then becomes tailoring his length to how far down you come. Ultimately, the degree to which you can control your length (for pace bowlers - even the slowest of them) determines how effective you are. Oh and you have to be pretty straight most of the time too (except when they back away of course).
Easy peasy. Don't understand why they can't all do it...