If we're being nitpicky, Kreider actually had 10 points in 13 games in 2014-2015, his age-23 season
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I blame the perceived problem with the Kreider's and the Buch's of the hockey world on the fans (a problem with fans across all sports in general). There's a big inability with sports fans to disregard the 'what is' with the 'what ought to be'. Maybe it's the way we're hard wired, but we just can't get over the fact that a player doesn't perform the way we've convinced ourselves they should.
People should've resigned themselves to the fact that Chris Kreider is a 20-25G/20-25A .55PPG player a long time ago. When he's 30 years old and puts up 30G/30A on a new team, it shouldn't surprise anyone IMO.
Buch is a different case. Has a lot more time to prove he's a player who can put up 30/30. But, like Kreider, I see it as a strong possibility that it's elsewhere. That's just sports. **** happens.