John Wick is a worse movie for having digital flashes and blood spurts, safety concerns aside, it looks way better to use blanks and squibs. There's a visceral response that is lost when things have to be added in post production. I've never seen a digital blood spurt that had anywhere near the impact of this classic from Robocop, there isn't a single kill in any JW that can compare:
(NSFW: Gore)