As I said several times, the decision includes confidence in your kicker. Citing Bullock's efficiency from the get go, is a much better take than simply saying the decision is "obvious", without rationale.
McPherson is 11 for 13 on 50+ yard attempts this year. As for Justin Tucker, he was 35 for 37 on FG attempts this year, and was perfect from 50 plus. His career percentage is 73%, and I'm sure some of the misses were the end of the half equivalent of Hail Marys. The odds of converting 4th and 1 is about 65%.
As for you last point, completely disagree. I've been watching football for almost 50 years and the willingness to forego a FG has certainly changed over time. However, we see teams misapply this... The Chargers opted not to kick 4 FGs against the Chiefs and lost in OT. As acknowledged earlier, maybe Bullock isn't the guy for that long of an attempt. But taking the lead, even if its only by 3 points, late in a play-off game is "playing to win".