"Universal" aka "Bristle" Knife Blocks: Blade Damage and Hygiene
Yes, very sharp/thin edged blades (think of something like a yanagiba or laser gyuto) will take damage because they will bite lengthwise into the plastic straws and get dulled and/or deformed/chipped. Also, an overfull plastic straw block can bend the edge out of hone because of uneven pressure applied to its sides.

ADDITION: Example experiment I did: Take Takamura HSPS (not the pro version), sharpened to the same angle these come with from the maker (around 18 degrees inclusive(!!). Very delicate knife but usable on a cutting board with care.), arm hair sharp. Stuff it in a bristle knife block a few times. No longer arm hair sharp.