most of the statistics kept for this look at how many runs you will score, on average, from certain situations. Averages do not take into account additional information you might have in a particular situation. The classic example is when the pitcher is batting in the national league. If the pitcher has a .090 batting average, then bunting would improve your chances of scoring because the chances of having a man on first with one out would be greater than the chances of him getting a hit or walk. All of that gets worked into the averages, and you can't treat every situation as the average situation.
oh wow, no ****, you should probably more strongly consider bunting when you have a pitcher hitting in that situation? luckily, scrolling down that link, they have the numbers broken down by hitting position for both NL and AL. now there's not anything specifically directed towards pitchers hitting so pinch hitters and double switches obviously factor in a bit, but you can get a general idea from analyzing just the 9 hole spot in NL lineups. (also in a 9th inning situation in a tied game with runners on 1st and 2nd with 0 outs, the pitcher likely isn't hitting, so you'll have a pinch hitter in there). but this goes along with your comment: "However, one can now uncover an instance where a successful bunt actually increases the expected runs using the ERT. The run potential with runners on first and second with no outs and the pitcher hitting is 1.238. A successful sacrifice bunt brings up the leadoff hitter with runners on second and third and one out; a state with a run expectation of 1.336. Again, this needs caveats: not all bunts are successful, but clearly given that this is based on overall averages, one can imagine circumstances in which a bunt is the correct strategy."
however, we didn't have a pitcher hitting .090 batting, so there goes the relevancy of your comment.
we know renfroe is struggling, ok? it's widely recognized. however over the course of the season, he's been our best hitter and one fo the best in the conference/country. ever thought that showing the confidence to let him swing away there might have given him the self-confidence boost he needed to get his head straight? bunting there shows that you have no confidence in him to have a productive AB and only hurts his self-confidence more. if he was a .220 hitter for the season, sure, go ahead and bunting might be a safer play. i however try to view 2 for his last 23 as still a relative small sample size that every player goes through in a season, and inexplicably the good ones go through tears where they follow up 2 for 23 with a 13 for 23 tear. it's how baseball goes. and you never know when the slump ends and the hot streak begins. for all we know today renfroe could go 4 for 5 with 2 HRs.