I understand where you guys are coming from -- it's almost like we're worried that keeping him with the big club might somehow overwhelm him, and he might fail to take that next step. We so rarely get players (forwards!) who display such talent we want to be super cautious.
The thing is, we so rarely get players (forwards!) who display such talent.

We're not used to them, or how to treat them. There are some players who are ready. Typically, they get drafted in the top 3, but every now and again, you get an outlier. If we lucked into the Czech Auston Matthews, and he's actually ready to make the jump, then he's best served by coming to the NHL, rather than going back to the 10th best league in the world, or whatever it is.
Chytil isn't a Pastrnak who had all the talent, but wasn't physically mature enough to play in the league the year after his draft; he's 6'2", 190+ lbs. and still growing. He looked like one of, if not the best players on the ice last night. If he continues to do so, he should stick with the club.
Kreider-Zibanejad-Buchnevich
Vesey-Hayes-Nash
Miller-Chytil-Zuccarello
Grabner-Andersson-Fast
Drool.