Why? Because you don't like entertaining things to watch or you don't like people using good math #smallsamplesize
I like people using good math. Missing a conversion is crushing. Making one when you're up typically doesn't mean much, especially early in the game.
Using the Win Probability Calculator, here are the Steelers odds of winning after their first TD (1st Q 9:54):
Miss XP or 2 point conversion (up 6-0): 74.0%
Make XP (up 7-0): 76.5%
Make 2 point conversion(up 8-0): 78.2%
So even just over 5 minutes into the game, making a 2 point conversion increases win odds by 1.7% over making an XP, but missing it decreases win odds by 2.5%.
So let's look later in the 1st on the Steelers' second TD (1st Q 1:13) to go up 12-3.
Miss XP or 2 point conversion (up 12-3): 82.3%
Make XP (up 13-3): 84.4%
Make 2 point conversion (up 14-3): 86.3%
At this point, a miss risks 2.1% and a make gains 1.9%.
The lower advantage of getting the extra extra point has to be factored into the calculations that say it's worth it to keep going for two because of the small chance of coming out ahead.