Note also that the layer striations are way more irregular and noticeable than what i’ve seen from most people’s photos (check the butterfly wing in the above photos, for example) as well as comparing directly to the sample rook from Formlabs (printed in black) i had lying around. My theory on why is - again, due to incompletely cured infill.
During a peel, a perimeter that’s well supported by the solidly cured infill will not move.
Conversely, a perimeter that’s not well supported, because the infill is soft, will slide slightly, making the layer-lines appear irregular and, thus, more noticeable.