The big glitch is that on a bunt with a runner at third, the runner almost always goes home, which is clearly unrealistic. The toughest part of the debate is first-and-third with less than two out and the pitcher or a weak hitter up; as the sim works now, there is no way to drop a bunt, move the runner to second, and have the runner hold at third most of the time. In real life, the most likely result of the play is the runner at first advancing, the batter out at first, and the runner at third holding. That happens 1% of the time in WIS.
On other bunts, I disagree with the premise that people leave the infield back to improve their chances of a double play because the squeeze is such a hot-button issue. In my case, I leave the infield back because I'm only paying a little attention to the game, working or reading while I play. It's not like MLB where our full-time job is to watch every pitch. We can debate whether taking advantage of that is sporting. I understand the tough-for-you argument, but also believe that most players would rather have me play 12 games in a night and only pay partial attention vs. playing 2 full-focus games on the same night.
Love the attempt to quantify the success rate. As arvid noted above to be meaningful a study would have to include all kinds of batters and runners (to a few here, all squeezes are outrages; to most who oppose the bunt, there's a difference between Mark Belanger bunting home Ozzie Smith compared to Frank Howard bunting home Jason Varitek. My belief from playing 40000+ live games is that the runner's speed does not affect the chances of success (I'm also convinced that HOLD has zero effect on stolen-base attempts, and only impacts double-play chances and taking extra bases on a hit). The batter's speed does seem to have some effect on the success rate.