If it's 8-0 in the 8th or 9th inning, I'm still fine with a bunt attempt. Maybe that bunt single jump-starts a rally.
Here's another thing to consider. With all the extreme defensive shifts going on, there are probably 4 or 5 times every game where hitters are robbed on plays that would have been a hit 10 years ago. So if it's fine for pitchers and defenses to have that extra advantage in their pocket, I don't see why it should be an issue for batters to bunt late in the game.
Make them earn all 27 outs, Gengh.