I hate them.
They're off in the wilds, there's no story for why they're there, and you need a fucking lot of them -- let's call it a boat load -- for projects. Lots of standing around ensues.
They need to make more sense.
Actual barnacles live in water, of course. They don't grow in the air. Well okay, they can live in the air, but they're not going to complete their whole life cycle there. (And fine, we're not real; we're fanciful. But I'm not seeing the amusing fanciful thing here.)
Planks were pesky for a brief moment, until they fell from the skies and now more reasonably come from trees at an acceptable pace (and the spontaneous planks should go away now, thanks). With the planks, one can see that a plank economy could emerge, with people even farming them on purpose as needed, you know, if an actual economy emerges and there's supply and demand forces.
I'm imagining that aqueous Glitch worlds are in the works, and then maybe there will be something that makes more sense with the barnacles. But I do feel like it would be tons better if they were less random, and part of some cycle... and maybe in the future, possibly farmable.