How do you warm up for comp?

I used to get into Comp Deathmatch to warm up before Comp Role Queue but now that's gone. I don't like VAXTA etc. They're good to learn aiming but once you know it imo They're not effective to warm you up. QP is just not a good warm up I feel. People play new heroes, supports practice their damage/movement, dps do weird ambitious flanks etc.

I've been warming up with open queue which is fine, but every 2nd game you pick tank and 4 teammates go dps, or you pick support and end up babysitting a Rein, Zarya, Dva orgy.

Why did they even get rid of comp deathmatch?