Since this is pellet dust rather than the powders from a mixed-grain feed it probably doesn't make a difference for *me,* but if I were using a mixed-grain feed I would certainly feed it wet or fermented.
Every couple weeks I run my feeders as empty as possible then dump all the fines they didn't eat into a pan to serve it as wet mash.
They think it's a treat. ;)
Since farmers have been using galvanized metal feeders for generations I suspect that quality of manufacture and condition make a big difference. I pitched a galvanized waterer that rusted faster than plastic can go brittle and crack. :)
Which is another reason to keep it sheltered from the...
I made a shelter for my feeder/waterer. The feed stayed dry through Zeta last fall.
https://www.backyardchickens.com/articles/an-outdoor-shelter-for-the-feeder-and-waterer.76487/
It seems to be hit or miss as to which feeders suit crumble better and which suit pellets better.
Of the ones I have these seems to do better with crumble:
And this does better with pellets: