I'm not sure what you mean. Do you mean using live photos ruins image quality or scrubbing and changing the key photo ruins image quality. Personally I've never had an issue ever. I use it regularly and keep my photos very close to my heart. I tag photos with people, review tags, remove duplicate photos, bad photos, or screenshots I don't need anymore. I have multiple albums and sorted. I have just over 9000 photos and just over 300 videos. I love the live photo because I can scrub until I find that perfect moment during the live and make that the key photo.

this is correct. however, it’s worth noting that over the years, despite the fact that the 12MP sensor stayed flagship for almost a decade, the Live Photo’s video metadata became higher resolution with every new iPhone generation