The three martials in my group all have multiple d20s... though that is for speed ing up combat: - Ok, so... with modifiers I got a 15 and a 9 - one hit one miss - ok, so 1d8 + mod damage, then flurry of blows... 17 and 23, 2d8 + twice mod... and stunning strike on one of them And then me and the player describe the scene

is much faster than: - a 15 - that hits, roll damage - a 9 - doesn't hit - ecc...

I've even seen some players/DMs describe every single blow as they hit/miss... with 6 players at my table I can't afford that, I have to try and speed thing up as much as possible.

I do the same with npcs, 3 bandits in initiative between two players? I have 3 colored dice; bandit 1 red, bandit 2 yellow, bandit 3 blue roll them together, let's see how many hit and I'll then use average dmg to speed it up.