Researchers need identifiable photos with accurate locations or dates. That’s all. We all like good quality photos better than poor ones, but as long as it’s identifiable, it’s useful. So post what you have.
What’s identifiable? Often we don’t know! So we do our best and let the IDers for a particular group work on it.
Research Grade means something, but less than it sounds like. If the group is hard to work with, even photos correctly identified by experts may languish as “needs ID” for years (e.g. some of my Festuca photos). And some things get to RG without good ID’s. Researchers really do use iNaturalist data. If they’re smart, they review the data they download before analyzing it!
I figure that identifying things from photos is hard enough that we should use all the clues we have, importantly including geography. I’m happier – more confident – when I can use morphology AND geography, but if geography is all I have, I use it. Some people get all huffy about that. Oh, well.
Technically, iNaturalist allows you to upload a photo of, say, a flock of birds many times, once for each individual bird. However, please don’t! It wastes the identifier’s time and wastes yours, too.
You do not need to remove an observation that has what you consider an incorrect ID added. You can just leave it, for more identifications to accumulate. Even better, explain why you consider your ID correct. (I have a file of comments I use frequently, so adding them can be fast.) Additional people who come along will read that, perhaps learn something, perhaps agree with your ID, eventually getting your observation to RG.
iNaturalist is so big that it can be frustrating to work with, but I hope you find it satisfying despite a certain amount of sloppiness, which is inevitable in citizen science projects.