The pillows that they made from the same material were in pillow cases and you could still feel it through them pretty easily. I doubt a sheet would help for the mattress. A mattress pad might be enough to cover the gross texture, but at that point you would have wasted money buying a gross feeling mattress when you could have bought one that didn’t need a mattress pad to feel like a bed.
Sequels having less features than the previous game without being a complete enough experience that you could ignore it. If they got rid of a lot of shallow features to focus more in-depth on others, that’s understandable.