I won't get into the whole "Romanov or Nazar instead of Dach" debate, because it is puerile, useless, and too soon to judge.
But I will say that I've liked Dach's play a lot this year. His speed for a big guy, playmaking, and ability to protect the puck have been a godsend for matching with Suzuki and Caufield. And his defensive play has been solid as a winger. He's also been good possession-wise, and 5-on-5.
That said, there's a couple things that Dach will need to improve if he wants to stay there long-term as a top-6 guy. First and more importantly, he needs to get a lot less cute with the puck, and shoot more.
I know that his shot pales in comparison to his linemates', but often Dach has grade-A shooting lanes because defenders check Caufield and Suzuki tighter (being your team's primary offensive cogs and elite shooters does that to you), and he still elects to pass.
Then you add in the fact that Dach must also be more consistent as a player. He has games where everything comes together and he looks like a world-beater with size, skill, will, and speed. Other times he looks a lot less visible.
And lastly, Dach has been more physical this year than he was in Chicago but he must still learn to come into his own more along the boards. He has the frame, strength, skating, and hockey IQ to be a real menace there instead of just "good", as he's been for us this year.
Anyways, that's it from me. Cheers, and have a good evening. I know I will.