I’ve actually read a bit about how ergonomic pillows like the Derila are designed to maintain the natural curve of the spine, especially for side and back sleepers. The main benefit seems to come from the memory foam adjusting to pressure points, which can reduce neck stiffness over time.
One thing worth checking is the pillow height — if it’s too high or low for your sleeping position, it can still cause strain despite the ergonomic design. I’d also recommend giving it a few nights to fully adjust before judging the comfort level.