No one can be at 100% all the time, even if it was an office job. People focus more to impress new co-workers, when something big is on the line etc. If Laine managed to do that constantly, ie ~20 goal months all the time, he’d become the greatest goal scorer ever in just a few seasons
I also think that Laine’s biggest problem is not his skating, defensive play or such but his inconsistency. The good news is that young players struggle with that the most, and it gets better with age.
82 games season + playoffs with lots of travel is also very physically and mentally demanding. Laine is still adjusting to that schedule which clearly shows, so I think that’s part of it too. I really don’t believe it is laziness at all, but rather that the adjustment in his line mates just gives an extra spark, something that breaks the norm.