I think the problem isn't that Grier doesn't value speed, rather it's that finding fast+big forwards who are actual NHL prospects (and not, e.g., AJ Spellacy) is pretty hard and they do value size over speed, plus they're not really willing to build a lineup of small+fast guys just to be fast.
They have been saying "bigger, faster, more compete" for two years now, it's just really hard to find those players at the top end of the lineup. Haltts is slow AF for sure, but at the point we picked him, I think you're really just picking for outlier skills and he has his shot. Is Cherny really that slow - I thought he was kind of average speed in the KHL but very big and tenacious? Musty isn't NHL fast but is he really NHL slow?
Smith is straight up NHL slow,
<50%ile in NHL edge for all skating metrics. But the other realistic choice there - Michkov - wouldn't be fast either, so it's hard to prioritize size + speed at that 4OA, which is why it was a damn shame we weren't picking 3rd.
This is honestly why I suspect they'll have Misa over Martone. He has size and speed, and finishing talent to be a complementary player. You're right it's a weakness of the pipeline but I'm just not sure exactly how you solve it, other than just having more high draft picks.