Well, here’s a discussion of how people can find such records salvageable: https://forum.inaturalist.org/t/poor-quality-photo-observations-from-the-past-have-received-research-grade/3980
And here’s an example approach to the general decluttering process: https://forum.inaturalist.org/t/is-very-vaguely-categorising-helpful-at-all/4036/6
Further, if an expert comes by later and sees that an observation wouldn’t be able to get farther along toward research-grade id (say some key field marks are not visible, or it needs microscopy), they can always mark it as “as good as it can get” and it will get filed as appropriate.