Just to add a comment on the scale of the problem of missing accuracy values, this from user @mikeburrell appeared on another thread:
It would be good to know if there are automated solutions to this problem, that would ensure that accuracy values are always captured, at least when they are present in EXIF data. This is not always happening.
When users add GPS coordinates manually, perhaps there could be a prompt the first time they do so without adding accuracy, which could be dismissed from then on.
I would also like to see an indicator when taking photos with the app, maybe an unobtrusive symbol that would indicate when the accuracy has reached a “good” value (less than 20 m?) or is very poor (more than 500 m?) - that could be a red-amber-green symbol or maybe even just the accuracy value itself in numbers.
Finally, if adding or taking a series of photos, could the app choose the location with the best accuracy value, by default, instead of, as it seems to do at present, only taking coordinates from the first image?