The ball was hit hard enough that you had to be sure you're getting 2 on the play, however it happens. Barring an errant throw, a 3-6-3 there is almost guaranteed.
If Rizzo is one step closer to home plate when he fields the ball, and not within a step or two of first base, then Baez has no question as to whether or not Rizzo touched first, and the DP is easy. It was just a perfect storm of circumstances. No fault anywhere.
To address your scenario, I don't know if the runner on 3rd broke for home on contact, or if he hesitated since the ball was hit hard and right at Rizzo. It very well may have been easier, but not necessarily smarter...if that makes sense.