I feed mash, moistened, in the am. They gobble it up, within the hour, so there is no freezing issue at all. The pecking action keeps it loose. Then, later in the day, I feed again. A smaller portion they feed on before heading to the roost.
Yes, I keep some pellets around, to put into a typical feeder, when I need to be gone for a day or three. Mash isn't ideal for those rarer times. But, for 95% of their feedings, it's mash, for the freshness and the economy.
The modern, mostly plastic feeders, were designed for the modern feed types. Mash was fed in a trough, way back when, and still works very, very well in a trough today. People sometimes question the "waste" of feeding mash, using a modern type feeder. That isn't ideal and is a bit of a mismatch.