I think sometimes new users opt out globally because it sounds good (more control over their observations) without fully understanding what it means.
I’ve also seen cases where high-volume observers opt out, quite possibly for good reasons and with the best of intentions, but then seem to be unable to keep up with notifications.
One factor here may be that users have two choices for opting out – they can opt out on all observations, or they can opt out on individual observations which have gotten IDs that disagree with theirs. In some cases, a user may want to maintain control over some portion of their observations (say, tricky taxa where they need to be able to see their own ID or where it is likely they will get wrong IDs from well-intentioned users) but they may want community feedback on others. However, they cannot opt out in advance on specific observations. I have wondered sometimes whether fewer users would opt out globally if there were an option to opt out individually in advance on selected observations.
This doesn’t help identifiers, of course, but maybe it helps understand the user choices, which may not be intentionally obstructive to the ID process.
I do think that having the option to opt out on individual observations is important. I have used this in a handful of cases where I have gotten a random wildly wrong ID from a user who was not responsive. In such cases, opting out puts the observation in the taxon where I want it so that it can be seen by specialists, which wouldn’t happen if the wrong ID puts the community taxon at something really broad like “insects”, and I have generally opted back in once it got enough additional IDs for the community taxon to be back on track.
In my experience the option to opt out as such is not the issue as much as opting out globally, which really does require that observers diligently follow notifications, particularly if any portion of their observations are taxa where they do not have expertise. I do wish that iNat had a better way of handling this, but I suspect that users who like this option would not be happy to have the conditions of their participation changed.
Correct. Users can provide IDs/comments as usual, but this input has no effect on the observation taxon – that is, on the taxon displayed at the top of the page and the taxon under which the observation is listed in searches. The taxon displayed for the observation will always be the taxon that the observer has selected as long as the observation is opted out. It will only change if the observer changes their ID or if they opt back in to community ID.
This means that if the observer’s ID is wrong or they entered it only with a broad ID like kingdom, it will continue to be displayed under this ID. The annoyance felt by many identifiers about opted-out observations is connected with this – if, say, the wrong ID is something that is completely out of range, we cannot correct this so that it is not displayed on iNat’s range maps. We can, at most, make the observation casual, by adding multiple disagreeing IDs or using the DQA. If the observations have a broad ID, they may get stuck in “needs ID” while multiple IDers try in vain to refine the ID until someone figures out what is happening and uses the DQA. In Identify, there is no indication that an observation is opted out, so it is often not obvious why an observation is not behaving as expected.