Strange, I wonder who's been consistently saying that for the last decade on these forums only to receive mockery from those who don't follow prospects.
Players should never be in the NHL at 18 unless they are a) Supremely skilled or b) Supremely intelligent.
Kotkaniemi is neither. Galchenyuk wasn't either.
The NHL, just like MLB, is a very, very hard league to play in. It's a long season, it's a grind, it's very fast (and consistently getting faster) and with the modern-day pro scouting, teams figure out tendencies very quickly and will take adventage of the opposing players' weaknesses. And just like the MLB, the vast majority of NHLers don't step right into the major leagues. I actually don't think any MLBers go straight from highschool / college to the majors, but anyway. Players have to progressively improve with incremental challenges.
It's why I lose a little bit of patience with the Colefield should be on this team! crowd. No, no, no. The NHL would chew him up. Hell, the AHL would probably chew him up at this point in his career. I'm not comparing the upside of the two players, just using them as examples because they were some of our top prospects, but Josh Brook was fantastic last year in the WHL and he's having a reaaaaal difficult time in the AHL so far.
And that's completely normal. The jump from Junior/college hockey is really steep.