Yes, it may indeed be too soft for some sleepers. Stomach sleepers, in particular, might find that the plush surface doesn't provide enough support to keep their hips aligned with their spine, potentially leading to lower back pain.
Additionally, heavier individuals (typically over 230 pounds) might sink too deeply into the mattress, compromising support and alignment. Particularly if they’re back or stomach sleepers. However, it's important to note that mattress comfort is subjective. What feels too soft for one person might be perfect for another.