It's still very early days to get worried as far as Slafkovsky is concerned. Bigger guys will generally take longer to develop. Look no further than Byfield for LA.
Also, Slafkovsky hasn't played with the same fire this year as last, but he's been good overall nevermind the stats.
People are just upset that he hasn't been bringing the same level of energy, hasn't asserted his will on the ice like he did last season without understanding that consistency in young players is very, very hard to achieve.
Even a guy like MacKinnon only started to truly dominate when he got into his D+5, and MacKinnon is 5x the talent that Slafkovsky is.
While Slafkovsky has failed to make a difference on his own, away from Caufield and Suzuki, the fact that we have to depend on a 20 year-old to lead the way for a second-line is a big part of what's wrong with this team in the first place.
Kirby Dach has only produced for us when spoonfed time on the wing of Caufield and Suzuki and on the PP. Away from them and at 5-on-5 I actually think he's been way, way worse than Slafkovsky over the course of the season.
We also have to show patience in Dach's case given that he suffered a devastating ACL/MCL tear last year that can take up to 18-24 months to fully heal, but he shares his part of the blame.
But the worst of the three so far this season has definitely been Newhook. And I think it makes sense from a player's coach like MSL to try and "give some candy" to a guy like Newhook when things haven't been going his way at all.
Moreso considering Slafkovsky seems to still have a good morale, and since Laine's return Dach hasn't been great at C but also hasn't been getting completely caved-in at 5-on-5 recently.
Next year we'll graduate Demidov into the NHL lineup, probably on a second line to spark some things there away from Caufield/Suzuki. But we're gonna need a good top-6 center to help him get the most of his opportunities, and if that doesn't come from within (Hage, Beck, Kapanen) it will have to be addressed by the GM.
In the meanwhile Slafkovsky will work on his game, get better, get more consistent, and in a few years I'm pretty sure he'll be a big part of our team's offensive outlook. I could see him easily get 60-70 points while being good defensively, physical, and horribly-effective on the forecheck.