You can check their stats if you want. They both had very few blocks ever since the leauge started to keep stats on them. I think that the risk/reward ratio is pretty bad when blocking shots and they probably thought so too, judging by their shot blocking stats.
Of course there are high danger situations in crucial games when you throw everything you've got in front of the puck, but as a rule of thumb Laine should just face the shot and try to get a stick in the lane instead of doing soccer saves with his feet.
Re-read my post. I'm not debating whether Jagr or Selanne had lots of blocks or not. I know they didn't because elite / high skill players were utilized differently back then. Your big scorers weren't asked to defend, block shots, or PK.
Nowadays, that is part of being a skilled NHL players. Don't compare Laine to Jagr or Selanne, compare him to Stamkos, Crosby, or any other elite forward.